We conduct laboratory tests to validate components: fabrics, buckles, straps, foam padding, zips, etc. For example, for a fabric: resistance to abrasion & tearing, colour fastness in UV light, resistance to washing, waterproofing, etc. Then a test is conducted on finished product replicating forces on backpack over a number of years in order to check strength of assemblies: the backpack is weighted, then placed on a dummy which reproduces the movement of fast walking over thousands of cycles.