The Ledge Ridgeline Hydration Pack in constructed with a durable dobby diamond ripstop. It has plenty of room at 250 cubic inches of oversized organization side pockets. Its bright colors and reflective taping make for high visibility. Stay hydrated with the two-liter reservoir the pack comes equipped with. Adjustable sternum and shoulder straps make for a customized comfortable fit. The 3D padded ventilated EVA back panel allows you to stuff that backpack full without compromising your back's comfort. You can listen to music with built-in Headphone port. The external access to your reservoir makes for refueling your fluid a breeze.