Adjustable running vest, ultralight durable vest, trail running, cycling, hiking, mountaineering, marathon, bike hydration backpack with reflective strips Lightweight, breathable and durable: The hydration backpack uses waterproof fabric, water can bead and slide off, and the honeycomb design with breathable mesh is adopted, the whole body is breathable, soft and skin-friendly and lightweight, which can adapt to various outdoor sports and is durable. Safety: Reflective strips on the front and back of the vest and on the zipper of the included running belt provide double safety in low light, allowing athletes to train at night or in low light. Adjustable fit: Double buckle design and an ergonomically adjustable waist belt that adapts to your body and prevents shaking, making it comfortable to wear whether you are exercising or exploring outdoors. Practical running belt: The running belt included in the backpack can hold a 7.5 \" phone, has three separate zippered pockets and a space for a headphone jack, and each zipper has a reflective strip to ensure safety and usability in low light. Plenty of storage space: A running vest suitable for both men and women, with a separate water bottle pocket (suitable for a 500 ml soft water bottle), a phone pocket that can hold a maximum of a 7 \" phone, and a large zippered pocket on the back for storing clothes, snacks and other necessities.