A4 Envelope

400 x 278 x mm
In stock - 934 LEFT

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. If you need sturdy, big book packaging look no further! The A4 is a popular cardboard envelope for mailing things like big books and sheet music through the post that are a bit too big for most other mailers!

From £0.73

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 & crafts materials, posters, maps, calendars and lots of other big, flat items through the postal system. The Lil A4 large envelopes are made from stiff 450gsm material, with specially designed folds to provide impact protection around the edges, to help minimise the risk of impact damage.  The envelope features our leading peel'n'seal / red tear-strip system for easy sealing and opening. 

All products within our envelope range are made from 100% recycled 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 do not 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 equivalent to jiffy bag bubble envelopes. This brilliant, tough little envelope range is one of our best selling 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 the 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.

Color Brown Corrugated
Flap Type Hotmelt Peel & Seal with red rip strip opening
Height 0
Glue Seams External seams
Internal Width MM 400
Width (mm) 301 - 400
Internal Length MM 278
Length (mm) 201 - 300
Internal Width Inches 15.7
Internal Length Inches 11
Item Thickness 450gsm / 640mic
Item Weight (g) 117
Pallet Size 100x120x165cm / 40x48x65"
Quantity per Box/Pack 150
Quantity per pallet 6600
Width 400
  • 100% recyclable

  • easy open tear strip

  • peel 'n' seal

  • supplied form strapped