A standard C5 envelope measures 162mm x 229mm. This is designed to fit A4 paper folded in half, or A5 paper unfolded. Standard A5 paper size is 148mm x 210mm.
A standard C6 size envelope measures 114mm x 162mm. This is designed to fit A4 paper folded into quarters, A5 paper folded in half or A6 paper unfolded (often the size of a flyer).
DL Envelopes. DL Envelopes (220 x 110 mm) are available in Plain or Window Face. These envelopes are wallet format (they open on the long edge) and are printed on premium 80gsm laser bond.
