Nupouch waterproof bags keep your belongings dry while being vibrant and colorful. Made out of tri-layer vinyl material, these traditional dry bags utilize a roll top seal to keep water out. Just fill the bag, roll the top over 3 times and connect the buckle. Whether on a boat, the beach or even at a water park, Nupouch waterproof bags will protect your stuff wherever you go. The 10L size is roomy and flexible. Along with your valuables, It can hold gear, lunch, and a change of clothes. Use it as a day pack and don't worry if it starts to rain! A sholder strap is included for easy carrying.