How to Choose the Correct Size and Style Envelope - What are C4, C5, C6 & DL Envelope Sizes
Whether you are trying to create a good impression, or simply get something delivered safely, choosing the correct envelope for your mailing is important in a product area where there are lots of different products available. The guide below will help you to identify the correct size and envelope features for your mailing.
Envelope Sizes (What are C4, C5, C6 & DL Envelope Sizes?):
The most basic envelope sizes are based around A4 paper size and A4 paper that can be folded, these are:
C4 – 324 x 229mm (12 3/4” x 9”) – will hold an A4 sheet unfolded.
C5 – 229 x 162mm (9” x 6 3/8”) – will hold A4 folded once or an A5 sheet unfolded. (Pictured here)
C6 – 114 x 162mm (4 1/2” x 6 3/8”) – will hold A4 sheet folded twice or A5 sheet folded once. (Pictured here)
DL – 110 x 220mm (4 1/3” x 8 3/8”) – will hold A4 sheets folded twice. (Pictured here)
The three main styles are:
Pocket envelopes – featuring a small fold over flap with the opening along the short edge of the envelope.
Wallet envelopes – featuring a small fold over flap with the opening along the long edge of the envelope.
Banker envelopes – featuring a triangular folding flap along the long edge of the envelope (commonly associated with greeting cards).
Envelope Sealing Method:
The three most common used seals are:
Gummed – require moisture to be applied to the adhesive on the flap and then press down to seal.
Press seal – flap and envelope have adhesive which just needs to be pressed together.
Peel and seal – has removable strip which reveals a line of self adhesive glue which holds the envelope flap down.
- Gusset Envelopes – This type of envelope has expandable sides allowing for thicker items such as catalogues to be mailed
- Padded Envelopes – Good for sending fragile items and items that need to be protected during transit. The walls of the envelope enclose either a laminated bubble lining, or shredded recycled paper lining.
- Board Backed Envelopes – Strong envelopes with a manilla board backing. Useful for sending important documents that need to remain flat and uncreased during transit.