(100) 4.5 X 7" Bubble Mailers #000 Padded Envelopes Shipping Self Seal USPS UPS Perfect for USPS, UPS and Fedex Light Weight, Save on postage Seamless bottom for maximum strength. Smooth side seams UPS, FedEx, DHL & US Postal APPROVED Extra – Wide 4.5″ Wide (4.5″ x 7″ Usable Space) Self Sealing – Just Peel and Stick 1/2″ Fins on Two Sides to Help Absorb Shock Labels and Ink Adhere Easily