SunComp Tech &Acirc; Hight Quality (2.5 mil -Thick) Poly Mailers Mailer Envelopes 100 Pack 10x13 Mailer Bags With Adhesive Strip- Water and Weather Resistant Envelope Bags (10"x13" 100 Pack) 2.5 mil Thick Bags protect your mailling item inside Pressure sensitive adhesive provides a high strength durable closure, water and dirt resistant High-efficiency mailers are perfect for shipping a wide variety of non-fragile items Heavy-Duty Weather, Tear, and Puncture Resistant - won't bust or break open, even if over-packed.