ONETOALL Running Vest - Lightweight 150g Hydration Backpack 2L for Trail Running Marathon Hiking

At just 150g (5.29oz), the ONETOALL running vest adds almost no weight to your kit while keeping 2 liters of water and your trail essentials within reach. New knitted and upgraded mesh fabric delivers full-back ventilation that keeps you cool and sweat-free on long efforts, even on BC's demanding switchback climbs and technical descents. The fully detachable chest strap locks the vest securely to your torso with no sliding or shifting at pace, and the ergonomic contouring reduces pressure on shoulders and back so the vest disappears into your body at high speed. Storage is organized for trail use: a dedicated bladder warehouse fits any standard 2L BPA-free reservoir, the main compartment holds a shell layer or lightweight towel, and front shoulder pockets (both elastic and zippered) give you quick access to gels, your phone, and small essentials without breaking rhythm.