The name pretty much says it all, although not in much detail! This bag is designed for coping with remote locations and the rigours of getting there, week in, week out. Inspired by rock-climbing haul sacks - designed for dragging up kilometres of cliff while loaded with a week's worth of gear - the Tuff Nut can handle whatever you throw at it. Available in four sizes so you can fit what you need.,The fabric is the same stuff used on the floors of One Planet's Antarctic tents, with double layers of 1000 denier nylon on the base. The handles are made from seatbelt webbing, while external binding makes the seams extra strong. Felt harness straps can be used to carry the Tuff Nut on your back, or hidden out of the way. We've used a big, lockable YKK zip (#10) on the big, lockable top opening, and we've kept it all simple: there's not much that could go wrong. There's reinforcing everywhere you could possible need it, a window ID panel for easy identification, and a key pocket for the essentials.