20 Best Poly File Envelopes [2024]

Are you looking for the best Poly File Envelopes? Based on expert reviews, we ranked them. We've listed our top-ranked picks, including the top-selling Poly File Envelopes.

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1 Sooez 10 Pack Plastic Envelopes Poly Envelopes, Clear Document Folders US Letter A4 Size File... Sooez 10 Pack Plastic Envelopes Poly Envelopes, Clear Document Folders US Letter A4 Size File...
2 EOOUT 24pcs Plastic Envelopes Poly Zip Envelopes Files Zipper Folders, A4 Size, Letter Size, 10... EOOUT 24pcs Plastic Envelopes Poly Zip Envelopes Files Zipper Folders, A4 Size, Letter Size, 10...
3 EOOUT 36pcs Plastic Envelopes Poly Zip Envelope Zipper File Folders, A4 Size, Letter Size, 11... EOOUT 36pcs Plastic Envelopes Poly Zip Envelope Zipper File Folders, A4 Size, Letter Size, 11...
4 FANWU Plastic Legal Size Envelopes with String Tie Closure, 1-1/4' Expansion, Side Load, Clear File... FANWU Plastic Legal Size Envelopes with String Tie Closure, 1-1/4" Expansion, Side Load, Clear...
5 EOOUT 20pcs Poly Zip Envelopes Plastic Envelopes, Expanding Plastic Envelopes with Zipper, Letter... EOOUT 20pcs Poly Zip Envelopes Plastic Envelopes, Expanding Plastic Envelopes with Zipper, Letter...
6 File Folders,Plastic Envelope Folder with Snap Closure,US Letter A4 Size Poly Envelopes with Label... File Folders,Plastic Envelope Folder with Snap Closure,US Letter A4 Size Poly Envelopes with...
7 6 Pack Clear Document Folders Plastic Envelopes Poly Envelopes File Envelopes with Label Pocket and... 6 Pack Clear Document Folders Plastic Envelopes Poly Envelopes File Envelopes with Label Pocket...
8 FANWU Plastic Letter Size Envelopes with Button & String Tie Closure, 1-1/6' Expansion, Side Load,... FANWU Plastic Letter Size Envelopes with Button & String Tie Closure, 1-1/6" Expansion, Side...
9 Sooez 10 Pack Plastic Envelopes Poly Envelopes, Clear Document Folders Plastic File Folders US... Sooez 10 Pack Plastic Envelopes Poly Envelopes, Clear Document Folders Plastic File Folders US...
10 EOOUT 8pcs Expanding Plastic Folders, Poly Zip Envelopes, Letter Size, 9.8 x 12.8 Inches, Assorted... EOOUT 8pcs Expanding Plastic Folders, Poly Zip Envelopes, Letter Size, 9.8 x 12.8 Inches,...
11 Plastic Envelopes, TIENO 5PCS Legal Size Poly Zip Envelope with Zipper, Expanding Plastic Zip... Plastic Envelopes, TIENO 5PCS Legal Size Poly Zip Envelope with Zipper, Expanding Plastic Zip...
12 EOOUT 30 Pack Clear Plastic Envelopes with Snap Closure Poly Envelopes Document Folders, US Letter... EOOUT 30 Pack Clear Plastic Envelopes with Snap Closure Poly Envelopes Document Folders, US...
13 CHEPULA A4 Plastic File Folder Poly Envelope Expanding File Wallet Document Organizer with Snap... CHEPULA A4 Plastic File Folder Poly Envelope Expanding File Wallet Document Organizer with Snap...
14 Guozi 12pcs Filing Poly Envelopes,Transparent Plastic File Folders with String-Tie Closure,Reusable... Guozi 12pcs Filing Poly Envelopes,Transparent Plastic File Folders with String-Tie...
15 Abgream 7 Pack File Folder - Expandable Poly Envelopes Plastic Document Folder Button Closure... Abgream 7 Pack File Folder - Expandable Poly Envelopes Plastic Document Folder Button Closure...
16 EOOUT 50pcs Plastic Envelopes with Button Snap Closure, Clear Plastic Poly Envelope, Folders for... EOOUT 50pcs Plastic Envelopes with Button Snap Closure, Clear Plastic Poly Envelope, Folders for...
17 12 Pack Plastic Envelopes Poly Envelopes, LEOBRO A4 Clear File Bags Document Folders Document... 12 Pack Plastic Envelopes Poly Envelopes, LEOBRO A4 Clear File Bags Document Folders Document...
18 Plastic File Folder Poly Pockets Envelope Expanding File Wallet A4/Letter Size, 6 Pack Large... Plastic File Folder Poly Pockets Envelope Expanding File Wallet A4/Letter Size, 6 Pack Large...
19 LABUK 35pcs Plastic Envelopes Poly Zip Envelopes, A4 Size Clear Zipper Folder with Label for School... LABUK 35pcs Plastic Envelopes Poly Zip Envelopes, A4 Size Clear Zipper Folder with Label for...
SaleBestseller No. 1
Sooez 10 Pack Plastic Envelopes Poly Envelopes, Clear Document Folders US Letter A4 Size File...
  • Colorful Transparent Envelopes & Large Capacity: 5 assorted colors: transparent blue, green, yellow, purple, and pink (each color with 2). It’s easy...
  • Premium Quality & Thickness Upgraded: Durable PP material plastic envelope folders
  • Design with Snap Button & Label Pocket: High-quality clear document bag with snap button perfect for US letter / A4 size paper and other small items...
  • Transparent Document Pouches: The see-through sleek document folder keeps contents visible and makes finding documents so easy without opening your...
  • Easy Storage: Our plastic pouch is portable to keep your items organized and help you sort the clutter, the envelopes bags can be used at school,...
SaleBestseller No. 2
EOOUT 24pcs Plastic Envelopes Poly Zip Envelopes Files Zipper Folders, A4 Size, Letter Size, 10...
  • PACKAGE CONTAINS: 24 pcs plastic zip envelopes to meet your different needs. You can also share and use with family and friends to enjoy the fun of...
  • PRODUCT COLOR: 10 colors (2 red, 2 yellow, 2 blue, 2 green, 2 white, 2 black, 3 orange, 3 rose, 3 purple, 3 sky blue). You can sort the items...
  • PRODUCT SIZE: 33 * 24cm / 12.9 * 9.4 inches, letter size / A4. Can meet your storage needs for a large number of files.
  • PRODUCT MATERIAL: We use high-quality PVC material, which is 60% thicker than similar plastic zip envelop folders. Thick materials can extend the life...
  • MORE USES: Our plastic zip envelopes can not only be used to store paper documents and with its excellent waterproof properties, but also be used to...
Bestseller No. 3
EOOUT 36pcs Plastic Envelopes Poly Zip Envelope Zipper File Folders, A4 Size, Letter Size, 11...
  • PACKAGE CONTAINS: 36pcs plastic envelopes in 11 colors (3 red, 3 yellow, 3 blue, 3 green, 3 white, 3 black, 3 sky blue, 3 purple, 4 Orange, 4 rose...
  • PRODUCT SIZE: 33 * 24cm / 13 * 9.5inch, letter size / A4 size. Can meet your storage needs for a large number of files.
  • MATERIAL: Our zipper folder is made of high quality PVC plastic. The zipper head is made of plastic material, which is very smooth to use and not easy...
  • PRODUCT FEATURES: Our products are in 11 different colors, various colors can not only add color to your desk, but also making it convenient to store...
  • PRODUCT USE: It can be used for file storage in homes, schools, college, offices, etc., and can also be used to store your personal belongings. A...
Bestseller No. 4
FANWU Plastic Legal Size Envelopes with String Tie Closure, 1-1/4" Expansion, Side Load, Clear File...
  • 【 Side-opening Poly Envelopes 】:6 Packs expanding plastic legal size envelopes clear folders with closure. String tie closure, Legal Size 14x10...
  • 【 1-1/4" Expansion 】:Expandable Gusset design allow our clear plastic legal size envelopes holds 200 sheets paper. Side loading expanding files...
  • 【 Visible in Clear Plastic 】 : The transparent plastic allows you to see what's contained in the folder immediately without having to open and...
  • 【 Adjustable Flap 】: Adjustable flap with 4 Pre-fold line, it help you make the plastic legal size envelopes more fit for different size documents...
  • 【 Tear and water resistant 】: Acid free and PVC free Poly material, sturdy and durable. This envelope folders with closure are more thicker,...
Bestseller No. 5
EOOUT 20pcs Poly Zip Envelopes Plastic Envelopes, Expanding Plastic Envelopes with Zipper, Letter...
  • PACKAGE CONTAINS: 20 expanding poly zip envelopes. A total of 5 colors (purple, blue, green, red, transparent), with various colors, to meet your...
  • PRODUCT SIZE: 9.8 * 12.8 inches (25CM * 32.5CM), the bottom can be extended up to 3CM. Upgraded oversize and capacity to meet your needs to organize a...
  • MATERIALS: Made of high-quality PP material, to ensure that the product will not be damaged after high-frequency use, and can maintain longer. Also to...
  • PRODUCT DESIGN: We have carried out a new design on the original letter size poly zip folders. Added extended corners at the bottom. The 3cm extension...
  • MORE USES: Not only can be used to store paper documents, but also be used to store electronic products, small clothes, stationery, travel supplies,...
Bestseller No. 6
File Folders,Plastic Envelope Folder with Snap Closure,US Letter A4 Size Poly Envelopes with Label...
  • 📁 Large Capacity Plastic Folders - Our folder measures 13.25 x 9 .25 inches, holds more than 100 sheets Letter A4 Size Papers.
  • 📁 Thickness Upgraded(0.18mm) - Our reusable envelopes are thicker than other Poly Envelopes in the market, sturdy and durable, protect your papers...
  • 📁 Acid-Free & Waterproof - Made of High Quality plasitc material, our poly file folder is great for organizing important papers sheets.
  • 📁 File Folder - The see-through document folder with Assorted Colors, keeps contents visible and makes finding documents easily without opening...
  • 📁 Organizing Folders with Label Pocket - keeps your items organized for school, home, work, office, travel and business trip. Unique Label Pocket...
Bestseller No. 7
6 Pack Clear Document Folders Plastic Envelopes Poly Envelopes File Envelopes with Label Pocket and...
  • [Premium Quality Mterial] Durable PP material plastic envelope folder, The envelope folder size is 13.25 x 9.25 inches perfect for US letter/A4 size...
  • [Colorful Transparent Envelopes] 6 assorted colors: transparent blue, green, yellow, purple, pink and red. It’s easy to organize and distinguish...
  • [Design with Snap Button and Label Pocket] clear document bag with snap button good for office, Plastic Envelopes have a pocket for labels to...
  • [Transparent Document Pouches] The see-through sleek document folder keeps contents visible and makes finding documents so easy without opening your...
  • [Easy Storage] Our plastic pouch is portable to keep your items organized and help you sort the clutter, the envelopes bags can be used at school,...
Bestseller No. 8
FANWU Plastic Letter Size Envelopes with Button & String Tie Closure, 1-1/6" Expansion, Side Load,...
  • 【 Expandable Letter Size Plastic Envelopes 】:Size 13x10 inch (33x25cm), with 1-1/6" gusset. Expanding plastic envelopes have 4 times capacity of...
  • 【 Plastic Folders with String Tie Closure 】:Full size flap with traditional button and string tie closure, its strings are longer and more...
  • 【 Sturdy & Durable Plastic File Envelopes 】:FANWU plastic file envelopes made of high quality Poly material, Acid free and PVC free. Thicker and...
  • 【 Visible in Clear Plastic Envelopes 8.5 x 11 】:FANWU Poly envelopes are clear, see-through, give clear view of contents, makes finding...
  • 【 Easy & Great Storage Tool 】:FANWU plastic translucent document holder is portable to keep your items organized and help you sort the clutter,...
SaleBestseller No. 9
Sooez 10 Pack Plastic Envelopes Poly Envelopes, Clear Document Folders Plastic File Folders US...
  • Colorful Transparent Envelopes & Large Capacity: 5 assorted colors: transparent blue, green, yellow, purple, and pink (each color with 2). It's easy...
  • Premium Quality & Waterproof: Durable PP material plastic and waterproof envelope folder with upgraded thickness to prevent tearing for durable using...
  • Design with Hook & Loop Closure and Label Pocket: High-quality translucent document bag with hook & loop closure, easy and convenient to take and...
  • Transparent Document Pouches: The see-through sleek document folder keeps contents visible and makes finding documents so easy without opening your...
  • Easy Storage: Our plastic pouch is portable to keep your items organized and help you sort the clutter, the envelopes bags can be used at school,...
Bestseller No. 10
EOOUT 8pcs Expanding Plastic Folders, Poly Zip Envelopes, Letter Size, 9.8 x 12.8 Inches, Assorted...
  • PACKAGE CONTAINS: 8 expanding plastic envelopes. A total of 4 colors (purple, blue, red, green), with various colors, to meet your various storage...
  • PRODUCT SIZE: The expanding poly zip envelope is 9.8 * 12.8 inches (25CM * 32.5CM), the bottom can be extended up to 3cm. Upgraded oversize and...
  • MATERIALS: Made of high-quality PP material, to ensure that the product will not be damaged after high-frequency use, and can maintain longer. Also to...
  • PRODUCT DESIGN: We have carried out a new design on the original letter size poly zip folders. Added extended corners at the bottom. The 3CM extension...
  • MORE USES: Not only can be used to store paper documents, but also to store electronic products, small clothes, stationery, travel supplies,...
Bestseller No. 11
Plastic Envelopes, TIENO 5PCS Legal Size Poly Zip Envelope with Zipper, Expanding Plastic Zip...
  • These poly ziplock folders are made of high quality PVC and the thickness is 0.2mm. Durable, waterproof and resistant to rubbing.
  • The dimension of this envelope is legal size 14*10*1.18 inch / 360*265*30 mm. The expandable gusset can be expanded to 1 inch for large capacity and...
  • Package included 5 packs poly zip envelopes, 5 colors in white, pink, yellow, green and blue meet your different needs.
  • Each envelope adopts a plastic zipper closure with metal ends for quickly opening and closing.
  • Perfectly to sort, organize and storage files, documents, posters, receipt, coupon, cards. Great for teachers, accountants, architects or lawyers use.
Bestseller No. 12
EOOUT 30 Pack Clear Plastic Envelopes with Snap Closure Poly Envelopes Document Folders, US Letter...
  • Colorful clear envelopes with large capacity: 6 different colors - translucent blue, green, yellow, purple, pink, white (5 per color). You can easily...
  • High-quality upgraded material: our durable PP plastic envelope folders are waterproof and abrasion resistant.
  • Design with snap button and label pocket: high-quality clear document folders with snap button, very suitable for the storage of US letter/A4 size...
  • Clear document pocket: The clear folder makes the inside clearly visible and makes it very easy to find documents without opening the envelope.
  • Easy to store: Our folders with snap button is easy to carry, can keep your belongings in order, and help you organize the sundries. The envelope...
SaleBestseller No. 13
CHEPULA A4 Plastic File Folder Poly Envelope Expanding File Wallet Document Organizer with Snap...
  • 【A4 Plastic Expanding File Folder】: A4 Size as 12’’x 8.5’’ and 0.3 thick,2.8" expansion (Normal A4 paper size).
  • 【Large Capacity Storage】:600 sheet capacity which makes it suitable for daily filing and storing of documents; Five vibrant...
  • 【Premium Material】:Made of high quality plastic material , the file holder is not easy to break and deform.with waterproof characteristics,can...
  • 【Advantages】:Cloth edging design:Cloth over-lock and metal reinforced buckle at both the corners and bottom edge; Snap Button & Business card bag...
  • 【Widely Usage】:Perfect for school like important files,books, subjects, stationery etc; For office like documents,business cards, tax receipts...
Bestseller No. 14
Guozi 12pcs Filing Poly Envelopes,Transparent Plastic File Folders with String-Tie Closure,Reusable...
  • 【Eco-Friendly】Made of high-quality plastic and it is good for waterproof, tear resistant and keeping clean.
  • 【Reusable】Tough materials can be reused at high frequencies, and they are the same as new ones no matter how long you use.
  • 【Dimension】Envelope Size: 325mm x 240mm / 12.8" x 9.4",fit any A4 sheet paper.String-tie closure to secure contents.
  • 【Unique Design】The expandable gusset can be expanded to 1 inches max for large capacity and can be accommodated up to 100 paper sheets.
  • 【Powerful Functions】Suitable for schools, offices and other occasions, canbe applied to the preservation, classification and transfer of...
SaleBestseller No. 15
Abgream 7 Pack File Folder - Expandable Poly Envelopes Plastic Document Folder Button Closure...
  • ☛ WHAT YOU GET --- 7 x File folder. 7 x Black gel ink pen. File folder color is: Red, Purple, Orange, Blue, Green, Yellow, Black. File folder size...
  • ☛ PREMIUM MATERIAL --- Made from super thick polypropylene material, the poly envelopes are durable and recyclable, tear and water resistant, no...
  • ☛ PRACTICAL DESIGN --- The see-through sleek document folder with assorted colors keeps contents visible and makes finding documents so easy without...
  • ☛ LARGE CAPACITY ---Our file folder size is larger than normal A4 paper. 50c thickness gives you the wider storage area than other folders, so you...
  • ☛ MULTIFUNCTIONAL USE --- Portable to carry it everywhere, such as for school, office, bank, meeting room, home use. Quickly and easily organize...
Bestseller No. 16
EOOUT 50pcs Plastic Envelopes with Button Snap Closure, Clear Plastic Poly Envelope, Folders for...
  • PACKAGE CONTAINS: 50 clear plastic envelope folders with button snap closure. The envelope bag can be used for school, home, work, office travel and...
  • PRODUCT SIZE: 12.79 * 9.6inches / 32.5cm * 23.6cm. It's a good choice to school or college and office.
  • PROFESSIONAL QUALITY: Made of high-quality PP plastic, clear and smooth surface, durable, tear-resistant, moisture-proof, thick and durable, colorless...
  • COLOR: Clear, with high transparency, no more complicated marking for classification anymore, you can directly check your files, making your office...
  • MINIMALIST DESIGN: Snap button closure design, easy to store or remove documents. Make your office life more orderly.
SaleBestseller No. 17
12 Pack Plastic Envelopes Poly Envelopes, LEOBRO A4 Clear File Bags Document Folders Document...
  • Colorful Plastic Envelopes: 12 pcs, 6 bright colors(2 pcs for each color), yellow, green, blue, purple, rose red, white, add something vibrant to your...
  • Versatile Plastic Folders: 12.76” x 9.15”, can be filled with paper or little things, keep things in order, reduce mess, bring comfortable...
  • Durable Document Organizer: Made of premium PVC plastic, thick, wear-resistant, hard to fade, waterproof, pretty protective; washable, reusable and...
  • Multipurpose File Bags: Ideal for study material, like test paper, review material, thesis; office document, like meeting information, project...
  • Use-friendly Snap Closure: Total 12 pcs plastic envelopes, all with snap closure, easy to open and close. Sealed nicely on both sides and use-friendly...
Bestseller No. 18
Plastic File Folder Poly Pockets Envelope Expanding File Wallet A4/Letter Size, 6 Pack Large...
  • 【Plastic Black Expandable File Folder & Large Capacity】📂 Letter / A4 size, Larger Than Normal A4 Paper / Letter Size Plastic Envelope...
  • 【Durable Snap Button Design】📂 Cloth over-lock and metal reinforced buckle at both the corners and bottom edge, offers double times service...
  • 【Premium Quality】📂 Our plastic wallet made from super thick polypropylene, tear and water resistant, no odor, non-toxic, environmentally...
  • 【Design with Label Pocket】📂 High-quality clear document bag with snap button perfect for US letter / A4 size paper and other small items...
  • 【Multifunction】📂Perfect for daily use, such as school subjects, office documents files, traveling A4 files and business cards. A great A4...
SaleBestseller No. 19
LABUK 35pcs Plastic Envelopes Poly Zip Envelopes, A4 Size Clear Zipper Folder with Label for School...
  • 【PRODUCT CONTAINS】35 pcs Plastic Envelopes. Our products can help you organize messy files, classroom items and travl storage, and give you a...
  • 【PRODUCT SIZE】13x9.5in/33x24cm, Letter size/A4 size Zipper Folders. The label pocket size is 3.5x2.4in/9x6cm, to help distinguish the files topic...
  • 【PRODUCT MATERIAL】The plastic envelopes made of durable PVC, transparent material can quickly and easily confirm the files inside. Waterproof poly...
  • 【SPECIAL DESIGN】The zipper design makes it very convenient for you to store and use.The color and label pocket design can be used to classify...
  • 【MORE USES】Our poly zip envelopes are beautiful and practical. In addition to being used in schools and offices, it is also used in home travel...

Having trouble finding a great Poly File Envelopes?

This problem is well understood by us because we have gone through the entire Poly File Envelopes research process ourselves, which is why we have put together a comprehensive list of the best Poly File Envelopess available in the market today.

After hours of searching and using all the models on the market, we have found the best Poly File Envelopes for 2023. See our ranking below!

How Do You Buy The Best Poly File Envelopes?

Do you get stressed out thinking about shopping for a great Poly File Envelopes? Do doubts keep creeping into your mind?

We understand, because we’ve already gone through the whole process of researching Poly File Envelopes, which is why we have assembled a comprehensive list of the greatest Poly File Envelopes available in the current market. We’ve also come up with a list of questions that you probably have yourself.

John Harvards has done the best we can with our thoughts and recommendations, but it’s still crucial that you do thorough research on your own for Poly File Envelopes that you consider buying. Your questions might include the following:

  • Is it worth buying an Poly File Envelopes?
  • What benefits are there with buying an Poly File Envelopes?
  • What factors deserve consideration when shopping for an effective Poly File Envelopes?
  • Why is it crucial to invest in any Poly File Envelopes, much less the best one?
  • Which Poly File Envelopes are good in the current market?
  • Where can you find information like this about Poly File Envelopes?

We’re convinced that you likely have far more questions than just these regarding Poly File Envelopes, and the only real way to satisfy your need for knowledge is to get information from as many reputable online sources as you possibly can.

Potential sources can include buying guides for Poly File Envelopes, rating websites, word-of-mouth testimonials, online forums, and product reviews. Thorough and mindful research is crucial to making sure you get your hands on the best-possible Poly File Envelopes. Make sure that you are only using trustworthy and credible websites and sources.

John Harvards provides an Poly File Envelopes buying guide, and the information is totally objective and authentic. We employ both AI and big data in proofreading the collected information.

How did we create this buying guide? We did it using a custom-created selection of algorithms that lets us manifest a top-10 list of the best available Poly File Envelopes currently available on the market.

This technology we use to assemble our list depends on a variety of factors, including but not limited to the following:

  1. Brand Value: Every brand of Poly File Envelopes has a value all its own. Most brands offer some sort of unique selling proposition that’s supposed to bring something different to the table than their competitors.
  2. Features: What bells and whistles matter for an Poly File Envelopes?
  3. Specifications: How powerful they are can be measured.
  4. Product Value: This simply is how much bang for the buck you get from your Poly File Envelopes.
  5. Customer Ratings: Number ratings grade Poly File Envelopes objectively.
  6. Customer Reviews: Closely related to ratings, these paragraphs give you first-hand and detailed information from real-world users about their Poly File Envelopes.
  7. Product Quality: You don’t always get what you pay for with an Poly File Envelopes, sometimes less, and sometimes more.
  8. Product Reliability: How sturdy and durable an Poly File Envelopes is should be an indication of how long it will work out for you.

John Harvards always remembers that maintaining Poly File Envelopes information to stay current is a top priority, which is why we are constantly updating our websites. Learn more about us using online sources.

If you think that anything we present here regarding Poly File Envelopes is irrelevant, incorrect, misleading, or erroneous, then please let us know promptly!

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FAQ:

Q: What are the best plastic file folders?

A: SummerZee Plastic File Folder is made from high-quality polypropylene which is nontoxic and nonradioactive. This folder has a very sturdy body with 13 pockets and 6 various colors to help you classify the documents. The folders come with a strong holder. There is a shortcut button to secure the cover. 6. YOTINO Large Capacity Expanding File Folders

Q: What is the best file folder for sticky labels?

A: Sooez Expanding File Folder with Sticky Labels This plastic file folder comes with a zipper to ensure that everything stays in place. It is perfect for Letter & A4 papers. There are 13 rooms and some extra pockets to hold pens, or stickers for additional use, also a roomy wide pocket for keeping pens, highlighters.

Q: What is an ergonomic plastic file folder?

A: This is an upgraded version of plastic file folders from Suntary. This is a waterproof and easy plastic file folder. This folder is ergonomic meaning that it can stretch. There is also a name card slot for keeping the name cards you received. This product is quite eco-friendly and non toxic. Easy organization and quick look!

Q: What is a poly exterior on a mailer?

A: These mailers have a poly exterior to prevent tearing or letting in moisture. These mailers have a poly exterior to prevent tearing or letting in moisture. . These unpadded mailers are made of durable, high-quality material.