C3 Envelopes

Not all envelopes are small. Our C3 envelopes are a great way to send large documents or items, such as A3 posters, maps, or blueprints.

Available across many of our envelope ranges and in a vast amount of colour options our C3 envelopes typically come in the size of 450 x 350mm but can sometimes vary slightly.

Browse our C3 envelopes below.
Showing 17 products
Black Matt Finish Bubble Bag Mailers
From £0.74
Black Matt Finish Bubble Bag Mailers
Available in 6 Sizes
Best Seller
Manilla Board Back Envelopes
From £0.26
Manilla Board Back Envelopes
Available in 17 Sizes
Best Seller
Black Premium Peel and Seal 180gsm Envelopes
From £0.43
Black Premium Peel and Seal 180gsm Envelopes
Available in 5 Sizes
Best Seller
Silver Matt Finish Bubble Bag Mailers
From £0.74
Silver Matt Finish Bubble Bag Mailers
Available in 6 Sizes
Best Seller
Black Metallic Finish Bubble Bag Mailers
From £0.67
Black Metallic Finish Bubble Bag Mailers
Available in 7 Sizes
Best Seller
Silver Metallic Finish Bubble Bag Mailers
From £0.67
Silver Metallic Finish Bubble Bag Mailers
Available in 7 Sizes
Best Seller
White Premium Peel and Seal 180gsm Envelopes
From £0.30
White Premium Peel and Seal 180gsm Envelopes
Available in 23 Sizes
Best Seller
Red Metallic Finish Bubble Bag Mailers
From £1.06
Red Metallic Finish Bubble Bag Mailers
Available in 4 Sizes
Green Board Envelopes
From £2.60
Green Board Envelopes
Available in 3 Sizes
Silver Board Envelopes
From £2.88
Silver Board Envelopes
Available in 3 Sizes
White Board Back Envelopes
From £0.26
White Board Back Envelopes
Available in 14 Sizes
Best Seller
Gold Metallic Finish Foil Envelopes
From £0.35
Gold Metallic Finish Foil Envelopes
Available in 8 Sizes