Our strongest sheets made of polyamide (PA6) in 2mm thickness are always the right choice if you are looking for the strongest possible stiffening. It can still be bent, but only with a relatively large amount of force.
It is therefore suitable as a strong, very robust, solid stiffener and reinforcement on backpacks, bags, bicycle panniers and many other projects. Due to its higher strength, it is not quite as easy to work with as polyethylene: although it can be drilled and sawn well, it is almost impossible to cut with a cutter or scissors. It also cannot be sewn with a sewing machine.
