The Speed Liner 15.5 is a rucksack for mountain bikers & trail runners alike. The slimline cut & the close-fitting, well-ventilated suspension system provide excellent comfort & generous freedom of movement. Thanks to the numerous pockets & the internal compression straps, the contents of the bag can be secured so that they're held in place even when the bag isn't full. Thanks to the stretchy softshell used on the main zip, the rucksack can be opened & closed easily even when full.