Review on Ultraspire Momentum 2.0 Hydration Pack - Minimalist 6L Vest with 4 x 550mL UltraFlask (Fluid Capacity - Sold Separately) by Pete Hahn

First I bought size M, what a problem. I was at the other end of the dimensions. So cords lay across most of my chest while the backpack was pushed aside. Since I couldn't get it in my back pockets, the bottle was almost impossible to get hold of. So I switched to size L. There is more pocket fat than I would like, but I can pull the pack up to my chest to access the rear bottles. However, remember that you DO NOT simply place the bottles in the holders. But instead of pushing them aside, the magnets passed. Sometimes this may require a little force. It works! But test it before you run it.