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. 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.

Showing 175 products
Cello Bags (Non-Header)
Cello Bags (Non-Header)
From £0.07
£0.07
White All Board Envelopes
White All Board Envelopes
From £0.20
On Sale
£0.20 £0.25
Single Wall Cardboard Box
Single Wall Cardboard Box
From £0.37
£1.07
Glassine Bags
Glassine Bags
From £0.11
£0.15
Honeycomb Padded Bag Mailers
Honeycomb Padded Bag Mailers
From £0.27
On Sale
£0.27 £0.39
Pearlescent Envelopes
Pearlescent Envelopes
From £0.11
£0.19
Paper Lined Envelopes
Paper Lined Envelopes
From £0.39
£0.48
Cello Bags (With Header)
Cello Bags (With Header)
From £0.07
£0.10
Coloured Kraft Paper Bubble Bag Mailers
Coloured Kraft Paper Bubble Bag Mailers
From £0.34
£0.34
Metallic Finish Bubble Bag Mailers
Metallic Finish Bubble Bag Mailers
From £0.21
£0.77
Textured Envelopes
Textured Envelopes
From £0.11
£0.18
Economy 90gsm Padded Bag Mailers
Economy 90gsm Padded Bag Mailers
From £0.14
£0.20
Kraft V-Flap Gummed Envelopes
Kraft V-Flap Gummed Envelopes
From £0.08
£0.21
Royal Mail PIP Boxes
Royal Mail PIP Boxes
From £0.40
£0.40
Translucent Envelopes
Translucent Envelopes
From £0.39
£1.22 £1.49
Metallic Finish Foil Bags
Metallic Finish Foil Bags
From £0.09
£0.20
Matt Bubble Bag Mailers
Matt Bubble Bag Mailers
From £0.41
£0.41 £0.50
CD Envelopes
CD Envelopes
From £0.11
On Sale
£0.20 £0.25
Matt Finish Foil Bags
Matt Finish Foil Bags
From £0.20
£0.20
White Business 120gsm Peel & Seal Envelope (155 x 155mm)
White Business 120gsm Peel & Seal Envelope (155 x 155mm)
£0.14
£0.14
Pouchette Envelopes
Pouchette Envelopes
£0.59
£0.59
Manila Brown 300gsm Peel & Seal Rigid Board Mailers Envelope (180 x 180mm)
Manila Brown 300gsm Peel & Seal Rigid Board Mailers Envelope (180 x 180mm)
£0.26
£0.26
Manila Brown 70gsm Gummed Business Envelope (60 x 60mm)
Manila Brown 70gsm Gummed Business Envelope (60 x 60mm)
£0.07
£0.07
V-Flap Peel and Seal Envelopes
V-Flap Peel and Seal Envelopes
From £0.18
£0.36
White Envelope (110 x 110mm)
White Envelope (110 x 110mm)
£0.11 £0.13
On Sale
£0.11 £0.13
White Business 120gsm Gummed Envelope (155 x 155mm)
White Business 120gsm Gummed Envelope (155 x 155mm)
£0.15
£0.15
Manila Brown 300gsm Peel & Seal Rigid Board Mailers Envelope (150 x 150mm)
Manila Brown 300gsm Peel & Seal Rigid Board Mailers Envelope (150 x 150mm)
£0.20
£0.20
Holographic Finish Foil Bags
Holographic Finish Foil Bags
From £0.20
£0.25
Grip Seal Bags
Grip Seal Bags
From £0.07
£0.07
White Business 100gsm Gummed Envelope (60 x 60mm)
White Business 100gsm Gummed Envelope (60 x 60mm)
£0.07
£0.07
Gloss Finish Bubble Bag Mailers
Gloss Finish Bubble Bag Mailers
From £0.48
£0.55
Manila Brown 320gsm Peel & Seal Rigid Board Mailers Envelope (120 x 120mm)
Manila Brown 320gsm Peel & Seal Rigid Board Mailers Envelope (120 x 120mm)
£0.20
£0.20
White Envelope (220 x 220mm)
White Envelope (220 x 220mm)
£0.30 £0.37
On Sale
£0.30 £0.37
Black Coloured Peel & Seal 120gsm Envelope (80 x 80mm)
Black Coloured Peel & Seal 120gsm Envelope (80 x 80mm)
£0.25
£0.25
White Business 100gsm Gummed Envelope (40 x 40mm)
White Business 100gsm Gummed Envelope (40 x 40mm)
£0.07
£0.07
V-Flap 100gsm Envelopes
V-Flap 100gsm Envelopes
From £0.25
£0.34
White Business 120gsm Gummed Envelope (140 x 140mm)
White Business 120gsm Gummed Envelope (140 x 140mm)
£0.11
£0.11
White Business 120gsm Gummed Envelope (146 x 146mm)
White Business 120gsm Gummed Envelope (146 x 146mm)
£0.14
£0.14
White Business 120gsm Peel & Seal Envelope (110 x 110mm)
White Business 120gsm Peel & Seal Envelope (110 x 110mm)
£0.11
£0.11
Cardboard Wine Bottle Case
Cardboard Wine Bottle Case
From £1.17
£1.17
White 120gsm Gummed Greeting Card Envelope (100 x 100mm)
White 120gsm Gummed Greeting Card Envelope (100 x 100mm)
£0.10
£0.10
White Envelope (130 x 130mm)
White Envelope (130 x 130mm)
£0.11 £0.13
On Sale
£0.11 £0.13
Mirror Finish Envelopes
Mirror Finish Envelopes
From £0.25
£0.51
White Cardboard Boxes
White Cardboard Boxes
From £0.94
£0.94
White Polyethylene Shipping Mailers
White Polyethylene Shipping Mailers
From £0.36
£0.36
White Envelope (220 x 220mm)
White Envelope (220 x 220mm)
£0.20 £0.25
On Sale
£0.20 £0.25
Fleck 125gsm Gummed V-Flap Envelope (130 x 130mm)
Fleck 125gsm Gummed V-Flap Envelope (130 x 130mm)
£0.08
£0.08
White Business 100gsm Gummed Envelope (105 x 105mm)
White Business 100gsm Gummed Envelope (105 x 105mm)
£0.11
£0.11