Teal Side-Loading Bubble Mailers – 27 Pack. Padded Envelopes; Internal Size: 13″ x 10″ (L x W); -Adhesive Flap: 3.15″. Lightweight bubble envelope, light parcel. Matte-coated bubble mailers to help maintain color. Side-Opening Bubble Mailers:Spacious loading opening with wide -seal flap.