Backpack components are approved in laboratory tests, includingfabric, buckles, webbing, foam, zips,etc. Fabrics are tested for resistance to rubbing, tearing, colour-fastness under UV rays, washing, waterproofing...A test on the final product, which speeds up the effects of impact on the backpack over the years, to check resistance of the assemblies: the backpack is weighted then placed on a dummy which then reproduces the movement of fast walking through thousands of cycles.