The Inca 18L Backpack is a great everyday bag that s practical and compact. Hydration compatible, with an EVA back system, removable hip belt and adjustable chest straps: Great for day trips or as a sports bag. Hydration Compatible: A compartment specifically for a hydration pack. A hydration bladder is not included. Chest/Sternum Strap: Offers support for your back by helping to distribute weight and balance your pack Lightweight: Compact, easy to pack and great for travelling. Bottle Pocket: Elasticated mesh pocket for bottles. Removable Hip Belt: Distributes weight evenly around the hips with extra padding for added comfort.