C6/C5

The C6/C5 envelope has dimensions of 229mm x 114mm giving it a surface area of 26,106 mm2. Its maximum enclosure size is typically around 110mm x 223mm. As the name implies, the C6/C5 envelope is a hybrid between the standard C6 and C5 sizes. With a width of 114mm it matches the C6 width, but its height of 229mm matches the C5 height. This makes the C6/C5 a versatile envelope that can accommodate contents meant for either C6 or C5 envelopes. It provides more space than a C6 but remains compact like the C6 for mailing ease. The unusual size bridges the gap between the very common C5 and C6 sizes. It allows flexibility when mailing items that need just slightly more area than a C6 but not quite the full C5 dimensions. The C6/C5 size is not as ubiquitous as C5 or C6 but serves a niche for mailings needing the in-between size.