Square Envelopes

Cello Bags (Non-Header)
Cello Bags (Non-Header)
From £0.07
£0.07
White All Board Envelopes
White All Board Envelopes
From £0.20
£0.20 £0.25
Glassine Bags
Glassine Bags
From £0.11
£0.15
Eco Honeycomb Padded Bag Mailers
Eco Honeycomb Padded Bag Mailers
From £0.27
£0.27 £0.39
Pearlescent Envelopes
Pearlescent Envelopes
From £0.11
£0.19
Paper Lined Envelopes
Paper Lined Envelopes
From £0.39
£0.48
Textured Envelopes
Textured Envelopes
From £0.11
£0.18
Translucent Envelopes
Translucent Envelopes
From £0.39
£1.22 £1.49
CD Envelopes
CD Envelopes
From £0.11
£0.20 £0.25
Matt Bubble Bag Mailers
Matt Bubble Bag Mailers
From £0.41
£0.64
Matt Finish Foil Bags
Matt Finish Foil Bags
From £0.20
£0.20
White Envelope (110 x 110mm)
White Envelope (110 x 110mm)
£0.11 £0.13
£0.11 £0.13
Grip Seal Bags
Grip Seal Bags
From £0.07
£0.07
White Envelope (220 x 220mm)
White Envelope (220 x 220mm)
£0.30 £0.37
£0.30 £0.37
White Envelope (130 x 130mm)
White Envelope (130 x 130mm)
£0.11 £0.13
£0.11 £0.13
Mirror Finish Envelopes
Mirror Finish Envelopes
From £0.25
£0.73
White Cardboard Boxes
White Cardboard Boxes
From £0.94
£0.94
White Envelope (220 x 220mm)
White Envelope (220 x 220mm)
£0.20 £0.25
£0.20 £0.25

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 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.