We conduct tests to validate the components: fabrics, buckles, straps, foam padding, zips, etc. For example, for a fabric: resistance to abrasion and tearing, colour-fastness in UV light, resistance to washing, waterproofing, etc. Then, a test is conducted on the finished product replicating the accelerated demands on the bag over a number of years to check the strength of the assemblies. Filled with weights it is placed on a mannequin that replicates thousands of fast walking movements.