Made of high-strength ripstop 500D PVC tarpaulin material with sturdy welded seam, the dry sack can prevent accidental scratches and guarantee its long term use. Suitable for almost any extreme adventure you might expect.The dry bag backpack is waterproof it can protect your belongings in the water.It can be hand-held or worn on your shoulder and has a transparent phone window that allows you to check messgae and answer, calls without takeing the phone out. Price for over 700 pcs is for sea shipment.