Progo 100 ct 12x15.5 Self-seal Poly Mailers. Tear-proof, Water-resistant and Postage-saving Lightweight Plastic Shipping Envelopes / Bags. Unsurpassed Water & Tear Resistance, heavy duty polyethylene White outer surface, grey inner lining 12" x 15.5" size, fits a wide variety of items Pressure sensitive self-seal, Light Weight & Time Saving 100 pieces pack