#4 9.5" x 14.5" Poly Mailing Envelopes Padded Bubble Book Mailers Waterproof Self Adhesive Bag 500 Pieces 2.5 millimeter thickness, Recyclable: Yes. Water Resistant, Lightweight and Padded Interior. Color: White/Grey, Paper Liner: Clear with antistat. Lip Size: 1.5 +/- , Bubble Lining: 3/16. Usable Dimensions: 9.5" x 13.5", Outer Size: 10.5" x 13.5" + 1.57".