Sometimes you just need a little extra room for your favorite shell or some extra water. The XL in the Columbia Mobex XL Backpack is exactly what that stands for. This packs ultralight weight is made possible by the Flex Frame construction which, like your tent, uses a network of flexible poles to give the pack shape and support. But unlike your tent this pack is designed to spring back to shape even if you take a spill. A clamshell main compartment makes it easy to access things even in the bottom of the pack. The packs nylon shell is water-repellent so sudden cloudbursts wont be an issue. And lightweight breathable shoulder straps make carrying your load comfortable.