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Cardboard Envelopes 400 x 278 mm (A4)

Cardboard Envelopes 400 x 278 mm (A4)

400x278mm | Box form: 320x198x80mm

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Free shipping on orders over £175

We want you to be 100% satisfied with any order placed with us. Therefore if you are dissatisfied with your purchase and wish to return an item you may contact us by email at within 30 days of your purchase

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Looking for big book packaging or sheet music envelopes? The A4 is a cardboard envelope large mailer and is perfect for delivering clothing, big books, cook books, puzzles, paintings, arts & craft materials, posters, maps, calendars and lots of other big, flat items through the postal system. The Lil A4 large envelopes are made from stiff 450 gsm material with specially designed folds to provide impact protection around the edges, minimising the risk of impact damage. The envelope features our leading peel'n'seal / tear-strip system for easy sealing and opening.

All products within our envelope range are made from 100% recycled material and are 100% recyclable. The Lil envelopes are the most eco-friendly, plastic free alternative to a standard padded envelope or bubble mailer and they represent a significant step forward in the removal of single use plastics from ecommerce packaging. Eco-friendly padded envelopes that are stuffed with post consumer recycled fibre actually use MORE material than our envelopes and are considerably slower to pack, yet they don't provide any additional protection or cost savings. This is why our envelopes are trusted to deliver products and media across the globe by the internet's biggest online retailer.

This range was co-developed with one of the Internet's largest retailers... so you might recognise our envelopes!

Tired of returns and unhappy customers? These envelopes are better than bubble mailers; the corner stiffness of the A4 envelope cuts damage in transit. Online retailers report nearly 70% fewer returns and 25% faster packing. Struggling with storage space for your packaging? The easy stack design of the A4 envelope is the answer. This range was co-developed with one of the Internet's largest retailers... so you might recognise our envelopes!

As Mainline Flatpacks Ltd., in 2011, our award winning Lil envelope range was hailed as the 21st century's equivalent to jiffy bag bubble envelopes. This brilliant, tough little envelope range is one of our best sellers for a reason. If you're looking for sturdy and cost effective big book packaging or sheet music envelopes, look no further than the Lil A4 envelope (rather than cheap alternatives that fall apart, leave your items damaged and your customers dissatisfied). Go on...burst that bubble! Your packaging is the first time that your customers physically experience your product. Getting it right is your chance to make the best first impression; we help you do just that.

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Fully FSC™ certified

Look no further when looking to change your packaging game and the planet

  • Free Shipping

    When you spend over £175

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Customer Reviews

Based on 3 reviews
Jane Hunt
5 stars

Great, speedy service and good product.

5 stars

Very good quality

Pat A
5 stars

Sturdy, easy seal, excellent for magazines