Designed specifically for endurance racing, Salomon's Advanced Skin S-Lab 12-Set hydration system is less of a backpack and more of a vest. Available in three sizes, the 300g garment grips your rib cage with minimum adjustment and maximum breathing space. The result is a pack that doesn't bounce around even as you dodge and weave past branches on trails through the thickest forest. The twin chest strap system has flexible mounting points so fits both male and female torsos.
The 12-litre carrying capacity is enough to comfortably hold compulsory items required for endurance races, and the main compartment can be divided in two to keep wet things away from dry. The drinking hose is routed efficiently under the arm, and the 1.5 litre bladder is housed in a thermally insulated pocket.
In fact, if you have a shortage of pockets in your life then this vest will solve that problem for good. There are 14 in total, designed for extra water bottles, for phone and navigation electronics, for gels, maps, a headlamp, and anything else you want to take running. You can reach almost all of them without breaking your stride. Hiking poles attach externally with a bungee system.
Francoise d'Haene wore one to take victory in the 2012 North Face Ultra-Trail du Mont Blanc, but the breathable quick-drying anti-microbial fabric vest also works for light day-hiking, road running, and mountain biking.
Salomon Advanced Skin S-Lab 12-Set, €170