Low Prices
Next Day Delivery
Large Stock
Basket £0.00

Square Envelopes

We are pleased to provide an extensive range of square envelopes, available in multiple sizes, colours and GSM to suit your requirements. 

Our square envelopes are built using the best quality paper and glue available meaning these will inevitably provide the quality you deserve. With an array of colours available also this means your post will stand out from the competition, or even more on brand!

Sort by:
1-12 of 80 View All
100×100mm - White Mailing Envelopes - 100gsm - Non Window - Gummed

100×100mm - White Mailing Envelopes - 100gsm - Non Window - Gummed

Box of 500 £12.00 INC VAT (£10.00 EX VAT)
More Details
220 x 220mm - White Mailing Envelopes - 100gsm - Non Window - Self Seal

220 x 220mm - White Mailing Envelopes - 100gsm - Non Window - Self Seal

Box of 250 £14.35 £12.72 INC VAT (£10.60 EX VAT)
More Details
220 x 220mm - White Mailing Envelopes - 100gsm - Non Window - Self Seal

220 x 220mm - White Mailing Envelopes - 100gsm - Non Window - Self Seal

Box of 250 £12.83 INC VAT (£10.69 EX VAT)
More Details
220 x 220mm - White Commercial Envelopes - 100gsm - Window - Self Seal

220 x 220mm - White Commercial Envelopes - 100gsm - Window - Self Seal

Box of 250 £13.80 INC VAT (£11.50 EX VAT)
More Details
130 x 130mm - White Invitation Envelopes - 100gsm - Non Window - Gummed

130 x 130mm - White Invitation Envelopes - 100gsm - Non Window - Gummed

Box of 500 £15.96 INC VAT (£13.30 EX VAT)
More Details
120 x 120mm - White Commercial Envelopes - 100gsm - Non Window - Gummed

120 x 120mm - White Commercial Envelopes - 100gsm - Non Window - Gummed

Box of 500 £16.50 INC VAT (£13.75 EX VAT)
More Details
140 x 140mm - White Invitation Envelopes - 100gsm - Non Window - Gummed

140 x 140mm - White Invitation Envelopes - 100gsm - Non Window - Gummed

Box of 500 £17.10 INC VAT (£14.25 EX VAT)
More Details
240 x 240mm -  White Mailing Envelopes - 100gsm - Non Window - Gummed

240 x 240mm - White Mailing Envelopes - 100gsm - Non Window - Gummed

Box of 250 £18.64 INC VAT (£15.53 EX VAT)
More Details
155 x 155mm - White Invitation Envelopes - 90gsm - Non Window - Gummed

155 x 155mm - White Invitation Envelopes - 90gsm - Non Window - Gummed

Box of 500 £19.14 INC VAT (£15.95 EX VAT)
More Details
165 x 165mm - White Invitation Envelopes - 100gsm - Non Window - Gummed

165 x 165mm - White Invitation Envelopes - 100gsm - Non Window - Gummed

Box of 500 £20.26 INC VAT (£16.88 EX VAT)
More Details
140 x 140mm - White Commercial Envelopes - 100gsm - Non Window - Gummed

140 x 140mm - White Commercial Envelopes - 100gsm - Non Window - Gummed

Box of 500 £20.52 INC VAT (£17.10 EX VAT)
More Details
155 x 155mm - White Commercial Envelopes - 100gsm - Non Window - Peel & Seal

155 x 155mm - White Commercial Envelopes - 100gsm - Non Window - Peel & Seal

Box of 500 £20.76 INC VAT (£17.30 EX VAT)
More Details

Why Choose Express Envelopes?

Express Envelopes are a premier online retailer of envelopes and copier paper with a huge range of over 1000 stock items. Order before 2pm you'll have it the next business day (excludes small packs and samples) , it's as simple as that.
Low Prices
Next Day Delivery
Large Stock

Express Envelopes is rated 4.80 stars by Reviews.co.uk based on 56 merchant reviews

4.80 / 5 Rating
56 Reviews
There was a delay in receiving the envelopes from Express, but once I phoned and spoke to the lovely lady, she helped me out. In fact, the carrier had delivered them to the wrong address but the lady at express sorted it all out for me. Thank you Marie!
Very good quality self-seal product - delivered before 10.30 am the next day. excellent service, Thanks, David
I had a last minute invitation to send out. Express Envelopes had the right envelope for the job and they arrived next day. Perfect.