Free envelope sizes and die lines
I may have mentioned DesignersToolbox before, but I can’t say enough how handy their resources for designers are. In particular, the free envelope size and die line charts. 12 basic envelope styles, with all the different standard sizes for each style listed out – for a total of well over 100 different size envelopes. Along with each size, a link to the .eps die line you can use for your projects is provided.