Waterproof - Made with professional seamless technology, our dry bag has the overall waterproof capability, making sure to keep your items and valuables dry when you do some water sports like boating, kayaking, surfing, rafting (but not underwater sports)..Durable - Made of 0.02 in (0.5 mm) thick upgraded wear-resistant PVC material, it's suitable for all kinds of outdoor activities. Waterproof bag is well adapted to various weather and environment..Multifunctional - Equipped with adjustable shoulder straps for shoulder carrying and backpack, our dry bag is very convenient for different occasions like boating, rafting, kayaking, hiking, camping, fishing, mountaineering, etc. The lightweight dry bag won't weigh down your arms or shoulders..Adjustable - 5L/10L comes with an adjustable and removable shoulder strap for cross-body style. 20L/30L/40L comes with two adjustable shoulder straps for backpack-style carrying and one side handle for hand-carrying, very convenient for your on-the-go..5 Sizes - (5L/10L/20L/30L/40L) to choose, each size comes in 7 colors (black, blue, orange, pink, pitch green, camouflage, flower), a right choice of gift for women and men. Each bag comes with a free emergency whistle, bringing comprehensive protection for your safe travel.