Ergonomic in its design the Vango Stryd 22 Rucksack sits comfortably on the back leaving lots of room for shoulder & arm movement with its tear drop shape Also in using the Air Force back system chest strap & sculpted shoulder straps the Stryd has a snug fit which remains stable during activity The design team have selected a 420 denier Cationic Nylon three times stronger than Polyester for this pack creating a stunning two tone effect when the pac is in sun light This backpack blends the best of outdoor performance with urban good looks & is as happy in the hills as it is on the underground