Lightweight hydration backpack designed for outdoor sports and everyday adventures. It is suitable for activities such as cycling, walking, jogging, night running, mountaineering, adventure, and marathon training. Key benefits Hydration on the go: keeps you hydrated during energy activities with a compact, practical design. Enhanced nighttime visibility: reflective strips improve safety in lowlight or night conditions. Weather and wear resistance: waterrepellent outer fabric helps protect contents from light rain; durable material reduces the chance of scratches during outdoor use. Helmet storage solution: a bottom net pocket provides convenient space to store a bicycle helmet; the net pocket can be retracted when not in use. Comfort and ventilation: back panel features a meshfilled elastic sponge that offers comfortable support, better breathability, and helps manage perspiration. The compact, lightweight structure makes it especially suitable for runners, cyclists, and skiers. Key attributes Material: waterrepellent oxford fabric Design: reflective strips for visibility; bottom helmet net pocket with retractable feature Comfort: breathable back panel with elastic sponge padding Weight and footprint: compact and lightweight for extended use 23 practical use scenarios Cycling commute or road rides: lightweight hydration backpack keeps you hydrated and adds helmet storage without bulk, with reflective strips for safety in low light. Trail running or night running: breathable back support and light weight reduce fatigue while you stay visible and protected from light rain. Mountaineering or hiking with helmet: the bottom net pocket accommodates a bicycle helmet when not in use, with the pocket retractable for streamlined carry.