Best Flat Mailers 2026

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Last Updated - 03.02.2026

Best Choice

01

druck.de

1,000 Envelopes - C5/6 DIN Long Envelope with Window - 110 x 220 mm - White Paper Envelopes - Self-Adhesive - Envelope for Bills, Letters, Weddings, Greeting Cards, Invitations

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9.7

Exceptional

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Thanks to the modern and high-performance machinery in Burgenland, our manufacturer ÖKI ensures incomparable quality from Austria.
Self-adhesive with adhesive strips for easy enveloping. Note: Mailing bags have the flap with adhesive strips on the short side, envelopes have the adhesive strip on the long side.
Pure white envelope for professional applications. With high-quality 80 g paper, your contents remain well packaged and protected from prying eyes.
Available with or without window. Windows are suitable for invoices with printed letterhead. Here you can see the address of the receiver through the transparent window.
Available in various sizes. From B4 pockets to C6 envelopes, you will find the right size for your occasion. Certificates that must not be folded are best sent in C4. C5/6 is suitable for everyday shipments that may well be folded.

27,96 €
02

progressPACK

progressPACK Premium PP W01.04 Shipping Envelopes - Corrugated Cardboard - DIN A4+ - 235 x 337 x 35 mm - Pack of 25 - Brown

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9.6

Exceptional

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Item Package Weight:3.1 oz
Inner dimensions: 235 x 337 x 35 mm
External dimensions: 352 x 250 x 40 mm
Brand: progressPACK

22,89 €
03

OFITURIA

Ofituria Plastic Envelopes for Shipping Clothes, Shoes, Accessories etc. Plastic Bag White Durable and Safe Packaging Bags for Shipping - Pack of 100, 175 x 250 + 40 mm

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9.3

Excellent

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

WIDELY USES These mailing envelopes are great for personal and business use. Very useful for documents, books and soft items (clothing and textiles such as T-shirts, blankets, scarves or other unbreakable items).
PLASTIC ENVELOPES - The envelope measures 175mm x 250mm + 40m The colour is opaque white and 100% resistant to moisture, splashes, heavy loads and scratches during transport.
ECO-FRIENDLY MATERIAL Plastic mailers are eco friendly with 70% recycled material. All bag components are 100% recyclable.
EASY SEALING: Shipping envelopes are self-adhesive for easy packing with a secure, water and stain resistant, tamper evident seal.
CONFIDENTIAL AND SECURE CONTENT: Opaque white envelopes guarantee the contents and confidentiality of the package. Resistant to pull, scratches and any liquid.

7,99 €
Value for Money

04

OFITURIA

Ofituria Plastic Envelopes for Shipping Clothes, Shoes, Accessories etc. Plastic Bag White Durable and Safe Packaging Bags for Shipping - Pack of 100, 175 x 250 + 40 mm

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9.0

Excellent

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

WIDELY USES These mailing envelopes are great for personal and business use. Very useful for documents, books and soft items (clothing and textiles such as T-shirts, blankets, scarves or other unbreakable items).
PLASTIC ENVELOPES - The envelope measures 175mm x 250mm + 40m The colour is opaque white and 100% resistant to moisture, splashes, heavy loads and scratches during transport.
ECO-FRIENDLY MATERIAL Plastic mailers are eco friendly with 70% recycled material. All bag components are 100% recyclable.
EASY SEALING: Shipping envelopes are self-adhesive for easy packing with a secure, water and stain resistant, tamper evident seal.
CONFIDENTIAL AND SECURE CONTENT: Opaque white envelopes guarantee the contents and confidentiality of the package. Resistant to pull, scratches and any liquid.

7,99 €
05

Wemk

Wemk Mailing Bags, Pack of 45 Shipping Bags for Vinted, 3 Sizes Mailing Bags Pack, Waterproof, Opaque, Abrasion-Resistant, Postal Bags, Logistics Packaging, Blue

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8.7

Very Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Your online shop support: the timeless and refined colours of our mailing bags, together with the word "thank you" in several languages, make you unforgettable. Stand out from the competition. The smooth surface of the shipping bag can write your greetings, labels, DIY text or leave markings on the packaging.
Save money – as the mailing bags are waterproof, you don't have to worry about your items getting wet even on rainy days. In addition, our plastic bags are feather-light, so you can save on shipping costs. Say goodbye to old-fashioned packages and welcome speed.
Perfect for various shipping requirements – perfect for shipping clothes, boxes, shoes, boxes. Perfect for mail, mailer, vinted online stores, envelopes and packages, clothes and gifts, also can be used as gift wrapping for Halloween, Thanksgiving, Christmas, birthdays.
High-quality materials – Our are made of high-quality polyethylene, which is environmentally friendly, durable and tear-resistant. The opaque material prevents the contents from being visible from the outside and ensures the confidentiality of your shipments. Each bag is equipped with a strong adhesive strip that ensures a secure and durable closure.
45 packs in 3 different sizes – with the dimensions 20 x 30 cm (15 pieces) + 25 x 35 cm (15 pieces) + 35 x 45 cm (15 pieces), our envelopes also have a 4 cm wide flap. Please confirm the size before purchasing.

10,99 €
06

Wemk

Wemk Mailing Bags, Pack of 45 Shipping Bags for Vinted, 3 Sizes Mailing Bags Pack, Waterproof, Opaque, Abrasion-Resistant, Postal Bags, Logistics Packaging, Blue

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8.4

Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Your online shop support: the timeless and refined colours of our mailing bags, together with the word "thank you" in several languages, make you unforgettable. Stand out from the competition. The smooth surface of the shipping bag can write your greetings, labels, DIY text or leave markings on the packaging.
Save money – as the mailing bags are waterproof, you don't have to worry about your items getting wet even on rainy days. In addition, our plastic bags are feather-light, so you can save on shipping costs. Say goodbye to old-fashioned packages and welcome speed.
Perfect for various shipping requirements – perfect for shipping clothes, boxes, shoes, boxes. Perfect for mail, mailer, vinted online stores, envelopes and packages, clothes and gifts, also can be used as gift wrapping for Halloween, Thanksgiving, Christmas, birthdays.
High-quality materials – Our are made of high-quality polyethylene, which is environmentally friendly, durable and tear-resistant. The opaque material prevents the contents from being visible from the outside and ensures the confidentiality of your shipments. Each bag is equipped with a strong adhesive strip that ensures a secure and durable closure.
45 packs in 3 different sizes – with the dimensions 20 x 30 cm (15 pieces) + 25 x 35 cm (15 pieces) + 35 x 45 cm (15 pieces), our envelopes also have a 4 cm wide flap. Please confirm the size before purchasing.

10,99 €
07

MA-Verpackungen

Pack of 25 Cardboard Envelopes 145 x 190 mm Size DIN A6, Self-Adhesive with Tear Thread, 50 mm Filling Height, Postage Optimised Shipping

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8.3

Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

With tear thread - ensures fast, clean opening without cutter or scissors at the receiver.
Variable filling height up to 50 mm - flexibly adjustable for flat contents or slightly more voluminous shipments.
Sturdy corrugated cardboard - tear-resistant, robust and reliably protects against kinks, bumps and damage.
SELF ADHESIVE CLOSURE - Saves time, no extra tape needed, securely closed in seconds.
Ideal for online retail & office - perfect for retailers, companies or private shipments.
Format: DIN A6 (145 x 190 mm) - Ideal for sending documents, small products or samples.

14,83 €
08

progressPACK

progressPACK Premium PP W01.04 Shipping Envelopes - Corrugated Cardboard - DIN A4+ - 235 x 337 x 35 mm - Pack of 25 - Brown

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8.2

Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Item Package Weight:3.1 oz
Inner dimensions: 235 x 337 x 35 mm
External dimensions: 352 x 250 x 40 mm
Brand: progressPACK

22,89 €
09

Wemk

Wemk Shipping Bags Goods Shipment, Pack of 30 Shipping Bags for Vinted, 3 Sizes Mailing Bags Pack, Self-Adhesive and Opaque, Waterproof, Abrasion-Resistant, blue, Modern

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7.9

Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Your online shop support: the timeless and refined colours of our mailing bags, together with the word "thank you" in several languages, make you unforgettable. Stand out from the competition. The smooth surface of the shipping bag can write your greetings, labels, DIY text or leave markings on the packaging.
Waterproof plastic shipping bags – Our are made of high-quality polyethylene, which are environmentally friendly, durable and tear-resistant, moisture, dust or dirt. The opaque material prevents the contents from being visible from the outside and ensures the confidentiality of your shipments. Each bag is equipped with a strong adhesive strip that ensures a secure and durable closure.
Perfect for various shipping requirements – perfect for shipping clothes, boxes, shoes, boxes. Perfect for mail, mailer, vinted online stores, envelopes and packages, clothes and gifts, also can be used as gift wrapping for Halloween, Thanksgiving, Christmas, birthdays.
More economical – Since the mailing bags are waterproof, you don't have to worry about your items getting wet even on rainy days. In addition, our plastic bags are feather-light, so you can save on shipping costs. Besides, they do not need to be folded or assembled, and the bag can be closed much faster.
30 packs in 3 different sizes – with the dimensions 20 x 30 cm (10 pieces) + 25 x 35 cm (10 pieces) + 35 x 45 cm (10 pieces), our envelopes also have a 4 cm wide flap. Please confirm the size before purchasing.

9,99 €
10

Netuno

Netuno Brown Envelopes Corrugated Cardboard DIN B4+ 26.5 x 35.5 cm 354 g Brown Envelopes Cardboard Shipping Envelopes Cardboard Shipping Bags Book Shipping Envelopes Sturdy Pack of 10

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7.8

Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Technical data: 10 brown cardboard envelopes in DIN B4+ format (265 x 355 mm), paper weight: 354 g/m², without window, opening on the short side, straight flap, self-adhesive with peel-off strips
Stable and high quality - Our envelopes are made of high-quality corrugated cardboard with a material thickness of 354 g/m² and are therefore particularly stable and durable. They guarantee that the content will arrive at the destination under optimal conditions.
Perfect protection - The corrugated cardboard mailing bags provide optimal protection for your shipments, whether they are papers, documents or small items. They protect your products from kinks and damage, especially at the corners and edges.
Comfortable and safe - The cardboard envelopes have a self-adhesive closure that gives the shipment even more security during transport. Thanks to the adhesive strip, they are convenient to close and can be opened quickly and easily.
APPLICATION - Our cardboard envelopes are ideal for sending flat content: documents, printed matter or media. They are excellent for sending calendars, catalogues, brochures, magazines, books, certificates, photos, CD, DVD etc.

16,50 €