Square Envelopes

Shop square envelopes in best-selling 150 × 150 mm and 155 × 155 mm, plus 100, 120, 130 and 140 mm sizes for wedding invitations, greetings cards and premium mailers. Choose premium white, natural manilla or vibrant colours with window-free faces for a clean presentation, and pick gummed, self seal or peel & seal closures. Heavier gsm and ultra-opaque options protect foiled cards and photographs, while recycled and FSC-certified papers support sustainability goals. Use filters to refine by size, colour and seal, and save with box, outer and pallet pricing for regular post. Orders dispatch quickly from our UK warehouse with free UK delivery when you spend £50+. Need more capacity or protection? Pair with gusset or board back styles to keep corners crisp and contents flat.

Cello Bags (Non - Header) - CS10045 - Envelopes.co.uk
Cello Bags (Non-Header)
On Sale from £0.02
£0.04
Glassine Bags - GLS11585 - Envelopes.co.uk
Glassine Bags
On Sale from £0.11
£0.15 £0.18
White All Board Envelopes - AB0 - RIP - Envelopes.co.uk
White All Board Envelopes
On Sale from £0.20
£0.20 £0.25
HP165165W - Eco Honeycomb Padded Bag Mailers - Envelopes.co.uk
Eco Honeycomb Padded Bag Mailers
On Sale from £0.39
£0.39 £0.47
Metallic Finish Bubble Bag Mailers - EUMB165G - Envelopes.co.uk
Metallic Finish Bubble Bag Mailers
On Sale from £0.21
£0.77
TL160B - Paper Lined Envelopes - Envelopes.co.uk
Paper Lined Envelopes
On Sale from £0.39
£0.48
Economy 90gsm Padded Bag Mailers - WZ215120M - Envelopes.co.uk
Economy 90gsm Padded Bag Mailers
On Sale from £0.14
£0.19
Kraft V - Flap Gummed Envelopes - A01116 - Envelopes.co.uk
Kraft V-Flap Gummed Envelopes
On Sale from £0.08
£0.21 £0.26
Pearlescent Envelopes - PM40 - 01C4 - Envelopes.co.uk
Pearlescent Envelopes
On Sale from £0.11
£0.19
Translucent Envelopes - B14C5 - Envelopes.co.uk
Translucent Envelopes
On Sale from £0.39
£1.22 £1.49
Textured Envelopes - CEB130AM - Envelopes.co.uk
Textured Envelopes
On Sale from £0.11
£0.18

Shop square envelopes in best-selling 150 × 150 mm and 155 × 155 mm, plus 100, 120, 130 and 140 mm sizes for wedding invitations, greetings cards and premium mailers. Choose premium white, natural manilla or vibrant colours with window-free faces for a clean presentation, and pick gummed, self seal or peel & seal closures. Heavier gsm and ultra-opaque options protect foiled cards and photographs, while recycled and FSC-certified papers support sustainability goals. Use filters to refine by size, colour and seal, and save with box, outer and pallet pricing for regular post. Orders dispatch quickly from our UK warehouse with free UK delivery when you spend £50+. Need more capacity or protection? Pair with gusset or board back styles to keep corners crisp and contents flat.