Review on AONIJIE Running Hydration Vest Backpack for Women and Men - Lightweight Trail Running Backpack 5.5L Gray: Stay Hydrated and Comfortable on Your Runs! by Bryan Orozco

Great for long runs. I did 13.5 and it was comfortable the whole time. It's light and small, but it has plenty of pockets for your phone, wallet and groceries for long trips. Although small, it fits in my large water bladder. It took me a while to adjust the fit by adjusting the straps and chest straps, but once I found one that worked for me I loved it. Even when running fast, it just fits snugly against my back and doesn't bother me. I would buy this again.