Earth Pak's 35L & 55L Heavy Duty Backpacks are designed to fit all types of adventurers - even the heavy-duty packers. Designed for those who plan to pack everything and the kitchen sink, the bags can carry up to a few sleeping bags and can even be used as camping pillows by night if you're camping for 1.5 weeks or 2.5 weeks on the same trip. Built with an anchor system to latch onto while boating, biking, or kayaking or attach your favorite accessories to take along a splash-proof pocket makes it easy to grab items on the go when you need them. For valuables, tuck them away in the bag's two interior pockets both mesh and zippered, where they will be completely protected by the superior quality of your bag. Waterproof Phone Case: Every Batman needs his Robin. With every earth pak product, an IPX Waterproof Phone Case is included, so that you can have extra protection for your phone.