Features： 1、Waterproof guarantee, the sturdy roll‑top closure system provides a safe waterproof tight to keep your equipment dry in any damp condition where the bag is not completely submerged. 2、Using 70D high tenacity nylon waterproof fabric, heat‑pressing treatment at the seam, waterproof grade IPX6, strong, light weight, good protection. 3、Easy to operate and clean, just put your equipment in the bag, grab the top braid and roll it down 3 to 5 times, then plug the buckle to complete the seal. 4、Equipped with detachable and adjustable shoulder strap, suitable for different body types and various carrying methods, light weight and easy to roll up, convenient to store and easy to carry. 5、Wide application range, used for outdoor activities, mountain climbing, camping, hiking, cycling, boating, kayaking, paddling, sailing, canoeing, surfing. Specification： Item Type: Waterproof Bag Material: 70D High Tenacity Nylon Waterproof Fabric Product Specifications: 1L, 5L, 10L, 20L, 35L 1L Size: Approx. 16 x 21cm / 6.3 x 8.3in 5L Size: Approx. 21.5 x 43cm / 8.5 x 17.0in 10L Size: Approx. 31.5 x 53cm / 12.4 x 20.9in 20L Size: Approx. 35 x 60cm / 13.8 x 23.6in 35L Size: Approx. 42.5 x 68cm / 16.7 x 26.8in Adjustable Shoulder Strap Total Length Range: Approx. 72-131cm / 28.3-51.6in (Tolerance of Manual Measurement) Where can our 1L, 5L, 10L, 20L and 35L bags be used? The following strategies are available for reference: The 1L and 5L storage bags are small in size, suitable for protecting small objects such as wallets, keys, towels, glasses, and compasses, and are also very popular with children. The 10L storage bag is medium in size, suitable for short trips and packing small items for travel. Suitable for protecting sweaters, toiletries, flashlights, mobile phones, notebooks, water bottles, etc. The 20L storage bag backpack is big enough to carry the items you need for a day trip. Suitable for protecting clothes, shoes, tablets, bath towels, binoculars, cameras, hand tools, food containers, etc. The 35L storage bag backpack is suitable for traveling more than one day. Suitable for protecting more clothes, life-saving bags, parachute hammocks, ponchos, water containers, etc. Package List： 1 x Waterproof Bag 1 x Shoulder Strap