Lightweight Hydration Vest Backpack for Running, Trail Running, Cycling, Racing, Marathon for Women and Ergonomic and Comfortable: This hiking backpack kit aligns your back while gently protecting your muscles. The air mesh cover keeps your back cool by maintaining air circulation, avoiding discomfort due to heat build-up and ensuring excellent air circulation and breathability. Lightweight for Running: Ultralight running vest, the weight of the backpack is 150g, which reduces a large part of the load during running. A tip for running: the less time you plan to spend on the road, the lighter a bag you will need. Designed for a medium or long distance run. Safe and multiple storage: reflective strips ensure safety during night runs, and buckles ensure the safety of additional straps. There is also a large drawstring pocket, a zippered pocket and a small elastic pocket on the front of the bag. You can put gels, sweets, papers, towels, mobile phones, keys, etc. in the front pocket. Quick and easy access even when sweating.es