Review on KUYOU Hydration Rucksack Backpack Climbing by Mike Lunde

Excellent product. I used it for the Spartan Race in Chicago. Holds just over 2 liters of liquid and never feels heavy. I was able to slip gu and snacks into the backpack (there are no outside pockets). It got dirty so I put it in the washer and dryer and it came out perfectly clean. The only complaint (although this may be a preference) is that the straps are like plastic near the shoulders. So if you get hot and sticky and it's on bare skin it can be annoying but it's so minor. Otherwise I loved it.