We complete laboratory tests to certify components: fabrics, buckles, straps, foam, zips... for example, for a fabric: resistance to abrasion & tearing, colour-fastness in UV light, resistance to washing, waterproofing, etc. A test is then conducted on the product replicating the accelerated demands on the backpack over a number of years to check the strength of the assembly: the backpack is weighted, then placed on a dummy which reproduces the movement of fast walking over thousands of cycles.