Printed 4.75 x 6.50 Self-Sealing Cellophane Bags. Self-sealing flat envelope cellophane bags are such handy and stylish business aids for storing and mailing paper goods. Simply stuff, seal, stamp and send! We carry clear and printed designs for you to choose from. Make cute hostess packets and customer packets that will stand out and get noticed. We have one of the largest online selections of self-sealing flat cello bags. Be sure and check out all the sizes of flat cellophane envelopes we carry.