The Basin Backpack is a 100% waterproof deck and board bag that can be used for any outdoor activity. Use the suction cups provided to attach the Basin to your SUP board or kayak allowing you to carry personal items such as your cell phone, tablet, camera, towels and more on your paddle adventure. The Basin features a two way purge valve located on the bottom of the bag allowing you to squeeze out any air trapped inside or fill the bag with air to make it float. The two-way valve even doubles as a draining tool if you want to fill it with ice and use the backpack as a portable water-cooler! Simply roll down the top closure and secure it shut to ensure that your bag is ready for the water.