Great material. Tough, sturdy and very well made. However, the waist strap is not easy to adjust. Rather than having a strap that clips together and you can quickly pull the strap to tighten, this one requires that you take the waist pack off and work with well made, but extremely stiff straps. If you take your jacket on and off like I do, it takes 5 minutes to readjust the strap to because it is so stiff and lacks flexibility. The design of the strap needs to be made much much easier.