Best Flat Mailers 2026

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Last Updated - 22.07.2026

Best Choice

01

Blanke Briefhüllen

Cardboard Backed Envelopes C4 229 x 324 mm White Pack of 100 without Window Self-Adhesive with Peel-Off Strips Straight Flap 120 g/m² Offset Blanke Briefhüllen

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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

UNIVERSAL SIZE - The C4 size (324x229mm) is perfect for A4 documents without the need to fold them. Ideal for businesses, offices, law firms and home use.
STRONG & STURDY - This high-quality cardboard back pocket (DIN C4) provides optimal protection for your important A4 documents. Thanks to the reinforced back panel made of sturdy cardboard, your contents remain kink-free and safe.
PERFECT FOR SHIPPING - Ideal for safely sending contracts, certificates, certificates, applications, photos and other sensitive documents. The rigid back panel provides additional protection against damage.
HIGH QUALITY MATERIAL - The mailing bag is made of durable white paper with a sturdy cardboard insert that ensures kink free delivery. The self-adhesive adhesive closure makes it easy to seal and saves time.

29,95 €
02

druck.de

Envelopes C5/6 with Window White Pack of 1000

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9.5

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

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.

29,80 €
03

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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9.2

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

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 €
Value for Money

04

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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9.1

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

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 €
05

kraftmax

50 x kraftmax Premium Packaging / Mailing Bags - Frustration-Free Cardboard Envelopes - DIN A5 - 23.5 x 18 cm

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8.8

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

️Frustration-Free Packaging: Easy to open, plastic free and environmentally friendly - perfect for commercial and residential shipments
Versatile: suitable for online retailers, offices, agencies and private frequent shippers
Sustainable and recyclable: environmentally friendly material - fully recyclable and stackable to save space
STURDY & KINK RESISTANT: Heavy duty cardboard envelopes in DIN A5 format - ideal for books, documents, DVDs and more
Format and quantity: DIN A5 (approx. 23.5 x 18 cm) - Available in 50, 100, 200 or 500 pieces depending on your needs

16,94 €
06

verpacking

verpacking Folding Envelopes 350 x 250 x 50 mm Brown with Block Base Double Peel and Tear Thread [Choice of Size and Quantity] Kraft Paper Pack of 50

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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

Sturdy kraft paper 120 g/m²: the brown folding bag made of tear-resistant and opaque kraft paper is a plastic-free, recyclable alternative to the plastic mailing bag and bubble envelope.
Flexible block base: the folded log base adapts to the filling material, creates a lot of volume and replaces bulky shipping boxes - the folded shipping bag reduces packaging volume, weight and shipping costs.
Double adhesive and free thread: two self-adhesive strips close the envelope securely and make it resealable for returns, the tear thread opens the shipment quickly without tools.
Dimensions: the outer dimensions are 35 x 25 x 5 cm (length x width x base depth) - enough space for books, folders, A4 documents, magazines or textiles.
Box contents: pack of 50 brown folding mailers made of kraft paper - recyclable and space-saving, suitable for online shop, goods shipment, book shipment and private shipping.

28,11 €
07

EmballaX

EMBALLAX - 30 Mailing Bags with Bag for Shipping Label - 3 Sizes S/M/L - Resistant/Waterproof - Shipping Bags for Clothes - Shipping Envelope for Boxes - Shipping Bags - Thank You

15% Off

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8.5

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

[Send stress-free packages!] - Made from high-quality polyethylene, our shipping bags for clothes are ultra tear-resistant and have an inviolable adhesive closure. Its complete opacity and waterproof protects your items from prying eyes and weather influences. Ship your packages worry-free, with the assurance that they arrive in perfect condition.
[ The clever package: cost-effective] - Avoid overlay and save without sacrificing quality. Our shipping bags offer the perfect balance between quantity and performance. With their timeless and beautiful colours, they radiate professionalism and seriousness as soon as they arrive. Stand out, gain customer loyalty and improve your seller rating while optimising your costs!
[ 14 DAY MONEY BACK GUARANTEE ] - At Emballax, the quality of our products is regularly checked by an international testing institute. If you are not 100% satisfied, you will receive a full refund.
No loss of time when packaging your packages. - Simplify your shipments with our mailing bags goods shipment, which are quick and easy to use. Put your items in, remove the protective film, flip the tab over, and you're done! Guaranteed secure closure. Practical extra: a bag for inserting the shipping note, which prepares your parcels even faster and more efficiently.
30 envelopes, 3 sizes, with bag for shipping ticket: this versatile set meets all your needs: clothes, magazines, books, small children's shoe boxes, DVDs and other non-fragile items. Can hold up to 3 kg, these goods shipping envelopes are odourless and easy to store. Perfect for managing your shipments efficiently and without any effort.

10,99 € 12,99 €(15% Off off)
08

Netuno

Netuno 25 Mailing Envelopes Made of Solid Cardboard White DIN A4 22.9 x 32.4 cm 450 g Cardboard Envelopes Cardboard Envelopes Full Cardboard Bags Cardboard Box for Documents Brochures

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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

Technical data: 25 white cardboard envelopes in DIN A4 format (229 x 324 mm), paper weight: 450 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 cardboard with a material thickness of 450 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 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.

22,80 €
09

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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8.3

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

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

23,03 €
10

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

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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.

Show more
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.

10,49 €