We use our own cookies and those of third-parties in order to improve your experience.
You can read more information about our Cookie Policy
Select as many or as few of these as you'd like...
*I understand that I am signing up for marketing emails
Search for Products
My dimensions are in:
mmcminches
I'm looking for:
BoxesPostalLabelsBags
Show Me:
Best fit - show the closest matches to these dimensionsItem fit - show only packaging bigger than these dimensions
Find Products
You are at the 5+ Rate. Add 4 items to boost your savings.
Best fit - show the closest matches to these dimensionItem fit - show only packaging bigger than these dimensions
BoxesBagsPostal
Black Large Letter Cardboard Envelopes are perfect for giving your mail a smart look when sending a range of thin or flat items and keeping your postal costs to a minimum. Our black large letter cardboard envelope range comprises C4 board backed envelopes; combining a robust black backing board with a smart and strong black paper front to keep your A4 sized important documents flat during transit and are lightweight and sized to comply with Royal Mail sizing to keep your postal costs to a minimum. These black large letter cardboard envelopes have a peel and seal adhesive strip closure to make packing quick, and provide a secure seal without the need for additional adhesives. An excellent eco-friendly solution, these black large letter envelopes are recyclable, biodegradable, and completely plastic free.
Please note: Large Letter sizing is up to 353 x 250 x 25mm with a 750g weight limit.