There are also a lot of pockets for people who like to have a separate compartment for everything. The large pouch on the back will accommodate up to a 2-liter bladder. That feature, combined with the pockets, can allow for a ride free of a separate tool/hydration pack. The GPX 5.5 Enduro’s fit is extremely adjustable and, utilizing a system of snaps and elastic fasteners, easily expands or contracts to different body shapes, body armor, and of course neck braces. Ventilation is on point, with plenty of openings to let out the heat when you want to.