J & K Bubble Mailers Kraft Bubble Mailers Self Sealing Bulk Padded Shipping Supplies Packaging Envelopes (#00 - 5" x 9") Qty. 25 Seamless bottom for maximum strength. Smooth side seams. 3/8" bubble lining provides excellent protection during shipments, Approved by UPS, FedEx, and USPS Satisfaction Guaranteed - Best Quality Mailers for the money NOT MULTISIZE KIT! SOLD BY SINGLE BAG SIZE. CHOOSE SIZE AND QUANTITY BEFORE YOU ADD TO CART/BUY. Listed by inner size dimensions!