Description: Material: Made of 190T polyester taffeta Material, waterproof, durable and wear resistant.Large Capacity: sack storage Bag Pocket beach, backpack closure, waterproof reinforced, buckle strap for hanging outdoor items .How to Use: the straps on the top of the waterproof backpack after stores your gear, then grab roll the straps 3-5 times and connect each side buckle of the sack backpack to complete the seal.Easy to Carry: Lightweight design, convenient travel, Comfortable and breathable, multiple sizes: 1.5L 2.5L 3L to meet your demands on different occasions.Widely Used: Suitable for outdoor activities, no matter hiking, camping, climbing, biking, even water sports like floating, kayaking, swimming, rafting, boating, canoeing, fishing, surfing, rowing.. Specification: Color: Black Material: 190T Polyester Taffeta 1.5L19.5cmx20cm/7.68inchx7.87inch, 2.5L 22.5cmx30cm/8.86inchx11.81inch,3L24cmx30cm/9.45inchx11.81inch Package Includes: 3 Waterproof Bag Note: Conversion: 1in=2.54cm, 1cm=0.393inchPlease allow slightly 0-1cm difference due to manual measurement.Colors can appear different depending on light and how the listing is viewed.Thanks for your understanding and attention. Wish you a pleasant shopping experience!