The travel/Gym backpack is durable and lightweight. Comfortable airflow back design with thick but soft multi-panel ventilated padding, gives you maximum back support. Good air permeability and heat dissipation with two widened curve padded shoulder straps, offer the lightweight carrying and of force reinforcement, relieve the pressure of your shoulders. Hidden opening hole on the top of this sports backpack can be convenient for you to enjoy music at any time without opening the backpack.the backpack is compatible with Hydration Bladder. The water hose can come out of bag. Whats more , You can connect the mobile power in the backpack from the opening. When you are not using it, you can fold it and store it in the trunk. When you need it,you can open it into a 30L light backpack, which is best for hiking, sports, camping and other activities. The unique design of dry and wet isolation bag help you place the wet cloth and sport equipment after swimming or exercise .Internally added mesh material for increase the area of force. NEVO RHINO To ensure your peace of mind, we offer two years of after-sales service for our backpacks. If you have any questions, please feel free to CONTACT us.