The Navigator Collapsible Backpack was designed to fit perfectly into other travel bags as you pack. Once you arrive at your destination you can bring this bag out and use it as you go about your adventures. This bag has been optimized to take up the least amount possible when not in use but give you the most space possible when you need it. It has 2 external water bottle pockets, a quick access top pocket, EVA molded back panel, and tamper proof zippers.