The volume of each backpack is measured using a standardised method: we fill the main compartment as well as each pocket with little balls. Then we empty these balls into a graduated container, which gives the equivalent volume in litres.

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... Then, a test is conducted on finished product replicating accelerated demands on the bag over a number of years to check strength of assemblies. The backpack is weighted then placed on a dummy which reproduces the movement of fast walking through thousands of cycles.