This tackle bag is designed to allow many Velcro attached Fly Boxes and Fly Foam. It is made from Nylon and Velcro lined Neoprene. The Bag opens and a 29 inch tongue of Velcro lined Neoprene to unroll which allows all your flies to be seen. This Bag holds all your supplies and can be attached to the back of the Hydration Back so you can add this to your fishing experience. The pack is super light and will float if dropped into the water. This Bag is one of the most innovative products made by VestPac for your fishing needs. Once you use this modular system for fishing you will never go back to the old Tackle Boxes.