Material: PVC Waterproof fabrics Capacity: 2L,5L,10L,20L,30L Useage: outdoor sports, such as Canoe, Kayaking, Rafting, Boating, Fishing, Hiking, Camping etc. Product Highlights: 1?Made from rugged 500D waterproof PVC.High-frequency welded seams to seal out water, sand, mud, and snow. 2?A comfortable nylon adjustable shoulder strap for easy carry 3?Roll-down top, which provides a waterproof seal when closed 4?Available in 10L/15L/ 20L/30L sizes?Choose the size according to your needs 5?Come with? IPX8 waterproof phone case - fits even the largest phone. Suitable for phones up to 6.7?? of diagonal screen size. Size after roll down 3 times of sealing 10L | 7.8in*19in 15L | 9.5in*19in 20L | 9.7in*22in 30L | 9.8in*25in How to use Step 1: Fold 3-5 times around the stiffenning blade Step 2: Close the buckle Packing: 1 * PVC Waterproof Bag