The Pro Expandable backpack is tailor made for anyone who feels like they never have enough room. Increase the main storage compartment up to two extra inches when you expand the bag using just a simple zipper! If all that space isn’t enough, two front pockets, webbing loops on the front for attachment of loose items, and dual zipper hydration pockets are sure to keep your belongings secure and organized. Feel and move like a professional wherever life takes you next!