Tape Logic PL453 Packing List Envelopes Window Style, 4-1/2 x 5-1/2", Box of 1000. Packing Slip Envelopes printed Packing List Enclosed. Black print on red background. These waterproof 2 mil thick self-adhesive poly envelopes keep your shipping papers secure. Will adhere to any clean dry surface. Just peel off the backing paper and apply. Envelope size 4-1/2 x 5-1/2". Inside dimensions 4 x 5". Window style allows shipping papers to double as the shipping label. Packed 1000 per box.