1. Constructed from Thick 500D PVC tarpaulin for high performance, durability, and protection. All seams are adopt advanced thermo welding craft to provide the best waterproof protection for your gear! 2. Choose different sizes, depending on your needs. An ideal product for your outdoor sports: kayaking, boating, sailing, swimming, fishing, Cruiseing, hiking, and cycling, etc. 3. You can put all of your personal accessaries including mobile phone, MP3, PDA, camera etc. into it.