Searching for Envelopes, No 6-3/4 (3-5/8-x-6-1/2) found in the White Color Group --PPSD Envelopes. Also, review our popular help pages for paper help. (To make a successful paper selection, it is important to have a brief understanding of text weight and cover weight papers.) AND envelope help (It is important to remember that inserts must always be smaller than the envelope dimensions.)