The BOUNDLESS: the missing link between the lightweight/reversible leg harness & the comfort harness dedicated to flatbed piloting: the long-flight comfort of a lightweight AND reversible flatbed harness! It also doubles as a well-thought-out rucksack & once the harness is on, the rucksack slips under the buttocks, in a pocket that increases the volume of protection. Very, very high-end. To try it is to adopt it, but you'll have to pay the price!