The Azarxis 5.5 L Running Vest Backpack is designed for serious athletes who need a hydration vest as well as a backpack for everyday outdoor sports. This versatile piece offers two compartments for your belongings - one for your necessities and another for your hydration needs. The 250ml space is perfect for keeping a drink within reach during your runs, bike rides, or hikes. The vest portion of this backpack has a lightweight design, making it comfortable to wear even during strenuous activities. With a capacity of 5.5 liters, this backpack is perfect for multi-day adventures. Its large, adjustable straps ensure a secure fit, while the comfortable shoulder straps provide a secure and breathable fit. This product is not only functional but also stylish, with a sleek gray color that blends in with any ensemble.