1、High quality rip-stop polyester fabric with watertight roll-top closure, keep your items dry. 2、Coated with watertight, well-stitched, tape-sealed seams, PU lining for waterproofing. 3、Roll-top design with buckle closure keeps your valuables dry. (Not for full submersion.) 4、Comes with 2 adjustable shoulder straps to use the dry sack as a shoulder bag and free your hands. 5、Ultra lightweight, perfect for outdoor activities such as kayaking, boating, fishing, rafting, hiking, swimming, camping, etc. The dry sacks are made from water-resistant polyester taffeta material and featured with roll-top closure to keep your valuables dry, perfect for kayaking, fishing, backpacking, traveling. Features: High quality rip-stop polyester fabric with watertight roll-top closure, keep your items dry. Coated with watertight, well-stitched, tape-sealed seams, PU lining for waterproofing. Roll-top design with buckle closure keeps your valuables dry. (Not for full submersion.) Comes with 2 adjustable shoulder straps to use the dry sack as a shoulder bag and free your hands. Ultra lightweight, perfect for outdoor activities such as kayaking, boating, fishing, rafting, hiking, swimming, camping, etc. Specifications: Material: Polyester taffeta Combo: Combo A / Combo B / Combo C (optional) Combo A (3pcs set) : 3L: 29.5 * 22.5cm / 11.6 * 8.9in 5L: 38 * 25cm/ 15 * 9.8in 8L: 40 * 30cm / 15.7 * 11.8in Combo B (5pcs set): 1.5L: 20 * 19.5cm /7.9 * 7.7in 2.5L: 30 * 24cm /11.8 * 9.4in 3L: 22.5 * 29cm /8.9 * 11.4in 3.5L: 36 * 24cm / 14.2 * 9.4in 5L: 25 * 37cm / 9.8 * 16.6in Combo C (6pcs set): 1.5L: 19.5 * 20cm / 7.7 * 7.9in 2.5L: 22.5 * 29cm / 8.9 * 11.4in 3L: 24 * 30cm / 9.4 * 11.8in 3.5L: 24 * 36cm / 9.4 * 14.2in 5L: 25 * 37cm / 9.8 * 14.6in 8L:  30 * 38.5cm / 11.8 * 15.2in Package List: 6 * Dry Sack (Combo C) 2 * Shoulder Strap 6 * Dry Sack (Combo C) 2 * Shoulder Strap