At County Office supplies we believe using good quality envelopes to make sure your mails arrives safely and is presentable is a key factor to impress customers and protential new clients. The most popular envelope is the DL size which is designed for a A4 sheet of paper folded into three in the portrait view. Other sizes such are C4 and C5. A C4 envelope is for a flat unfolded A4 sheet of papers(s) and the C5 is for either A5 size paper(s). With our range of envelopes, we have various sizes, weights and colours to suit your requirements.