C3 Envelopes

C3 Envelopes for Large Document Packaging

Discover our diverse C3 envelope collection, perfect for A3-sized letters. With various sizes, colours, and styles available, finding the ideal envelope is a breeze. C3 envelopes measure 324 x 458 mm (12.8 x 18 in). We also offer convenient options like peel and seal closures.

Our C3 envelope collection includes a variety of styles, colours, and finishes to suit both business and personal needs. From classic white and natural tones to vibrant colours, these envelopes are designed to elevate the presentation of your stationery.

Order a free sample to experience the premium quality of All Colour Envelopes, or add a box to your basket and shop professional quality envelopes today.

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Sale

C3+ Polypost Polythene Wallet Peel & Seal White (Qty 100) 330mm x 430mm

Boxed: £16.70
Unit: £0.17 £18.06

Sale

C3+ Polypost Polythene Pocket Peel & Seal White 330mm x 430mm (Qty 500)

Boxed: £125.05
Unit: £1.25 £135.23

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Sale

C3+ Polypost Polythene Pocket Peel & Seal White 330mm x 430mm (Qty 500)

Boxed: £80.15
Unit: £0.80 £86.70

C3 White Peel & Seal Pocket Envelopes 120gsm (Qty 125) 324mm x 450mm

Boxed: £37.15
Unit: £0.37

Sale

C3 White Padded Bubble Pocket Peel & Seal (Qty 50) 300mm x 430mm

Boxed: £24.50
Unit: £0.27 £26.80

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C3 White Gusset 140gsm Envelopes (Qty 125) 324mm x 457mm x 30mm

Boxed: £51.70
Unit: £0.52

C3 White Board Back 120gsm Peel & Seal Pocket Envelopes (Qty 100) 324mm x 450mm

Boxed: £40.10
Unit: £0.40

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C3 White 350gsm Board Peel & Seal Envelopes (Qty 100) 324mm x 450mm

Boxed: £49.10
Unit: £0.49

C3 Metallic Rose Gold Blush Padded Bubble Envelopes (Qty 50) 320mm x 450mm

Boxed: £56.70
Unit: £0.57

C3 Metallic Red Padded Bubble Envelopes (Qty 50) 320mm x 450mm

Boxed: £61.30
Unit: £0.61

C3 Metallic Purple Padded Bubble Envelopes (Qty 50) 320mm x 450mm

Boxed: £64.50

C3 Metallic Green Padded Bubble Envelopes (Qty 50) 320mm x 450mm

Boxed: £64.50

C3 Metallic Gold Padded Bubble Envelopes (Qty 50) 320mm x 450mm

Boxed: £45.40
Unit: £0.45

C3 Metallic Blue Padded Bubble Envelopes (Qty 50) 320mm x 450mm

Boxed: £64.50
Unit: £0.77

C3 Matt Oxford Blue Padded Bubble Envelopes (Qty 50) 324mm x 450mm

Boxed: £89.40
Unit: £0.89

C3 Matt Gold Padded Bubble Envelopes (Qty 50) 320mm x 450mm

Boxed: £63.65
Unit: £0.64

C3 Matt Black Padded Bubble Envelopes (Qty 50) 320mm x 450mm

Boxed: £85.95
Unit: £0.86

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C3 Matt Black Padded (Paper Finish) Bubble Envelopes (Qty 50) 320mm x 450mm

Boxed: £51.00
Unit: £0.51

C3 Manilla Gusset Pocket 140gsm Peel & Seal Envelopes (Qty 125) 324mm x 450mm x 30mm

Boxed: £81.15
Unit: £0.81

C3 Manilla Board Back 120gsm Peel & Seal Pocket Envelopes (Qty 50) 444mm x 368mm

Boxed: £20.20
Unit: £0.20

C3 Manilla Board Back 120gsm Peel & Seal Pocket Envelopes (Qty 100) 450mm x 324mm

Boxed: £34.90
Unit: £0.35

C3 Manilla 180gsm UnGummed Pocket Envelopes (Qty 100) 444mm x 358mm

Boxed: £41.80
Unit: £0.42

C3 Manilla 115gsm Peal & Seal Envelopes (Qty 125) 324mm x 444mm

Boxed: £28.60
Unit: £0.29

C3 Manilla 115gsm Gummed Self Seal Envelopes (Qty 125) 324mm x 450mm

Boxed: £28.25
Unit: £0.28

C3 Manilla 115gsm Gummed Pocket Envelopes (Qty 125) 324mm x 444mm

Boxed: £27.90
Unit: £0.28

Sale

C3 Lime Green Padded Bubble Bag Envelopes (Qty 50) 324mm x 450mm

Boxed: £63.65
Unit: £0.64 £68.79

Sale

C3 Bordeaux Padded Bubble Bag Envelopes (Qty 50) 324mm x 450mm

Boxed: £63.65
Unit: £0.64 £68.79

C3 Black Luxury 180gsm Peel & Seal Envelopes (Qty 200) 324mm x 457mm

Boxed: £112.00
Unit: £1.12

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C3 Black Gloss 350gsm All Board Envelopes (Qty 100) 330mm x 457mm

Boxed: £75.00

C3 (A3) Board Back Envelopes - Please Do Not Bend (Qty 50) 324mm x 450mm

Boxed: £17.50
Unit: £0.14

330mm x 470mm Matt Black Padded (Paper Finish) Bubble Envelopes (Qty 50)

Boxed: £45.00
Unit: £0.56

C3 Envelopes FAQs

For ecommerce and business use, C3 envelopes are ideal for packaging larger items like product brochures, catalogues, and artwork. Coloured envelopes can also enhance your brand’s identity, while bubble-lined options provide additional protection for delicate items. Bulk purchasing options are available to save time and money. For more information, take a look our bulk envelopes page.

How big is a C3 envelope?

A standard C3 envelope measures 458mm x 324mm. This is designed to fit A3 paper unfolded (which is double the size of A4 paper). Standard A3 paper size is 297mm x 420mm.

What are C3 envelopes used for?

C3 envelopes are used for important business documents, such as proposals, presentations, and official documents. These envelopes can also be used for artwork like prints or photographs if stored correctly. They can also be used for other online e-commerce shipments.

What our customers say

Consistently excellent quality products and their turnaround time and customer service is brilliant

Have been using All Colour Envelopes for years and they have never let me down. Our business couldn't survive without them.

Actually really impressed Fantastic prices, and the quality of the products we have received are exceptional.