BRONZY goal is to create moving experiences with and around our products and inspire everybody to live a healthy,balanced and active life through outdoor. Our outstanding waterproof quality is base on selected materials that are developed for specific applications. All the products with extreme degree of waterpoofing is achieved using a process known as high fruquency welding(HFW).HFW involves the application of high frequency voltage to the objects that need to be welded. We have been developing and manufacturing various series products,such as dry bags,waterpoof backpack,waterproof duffle bags ,waterproof cycling bag ,messenger bags ,and outdoor accessories. This black dry bag waterpoof backpack 30Liter ,we propose a new concept of waterproof to protect your gear safe and dry from people's trip,boating,swimming,rafting,kayaking,or riding a motorcycleor outdoor activities.