Trekking plane cover for backpack - 40 to 90 litres

We conduct laboratory tests to approve the components:
fabrics, buckles, straps, foams, zips, etc. Example, for a fabric:
resistance to wear, tearing, colour-fastness in UV rays, washing, waterproofing, etc.
A final test on the finished product simulates the kind of treatment to which it will be subjected over several years, to assess the strength of the assembly. The backpack is filled with weights and placed on a dummy that reproduces the movement of fast walking through thousands of cycles.