Printed 6.25 x 9.5 Self-Sealing Cellophane Bags. Self-sealing flat cello bags are a stylist way to present your glamour books, beauty brochures, CDs, and other misc literature or flat items. The following will fit in this size bag: Mary Kay®Beauty Book. This size works great for regular sized paper that is folded in half to a size of 8.5 x 5.5. Our self-sealing flat cellophane bags are durable for mailing . Printed designs have clear backgrounds which allows some of the contents to show through, depending on the density of the design on the cello bag. We carry many, many items for the direct sales professional including our Doorknob Delivery Bags.