"Was really excited to try this out. It’s lightweight and minimalist. Felt comfortable when I tried it on at home. Took it out for its first run and it just felt awful. The water bottle (I only filled one) was bouncing and flapping all over the place and the mouthpiece banging on my chest. I pulled the straps as tight as they could go and tried to use the excess strap to lock it down but it didn’t work. I was running along holding it down.. in the end I could only stick it for one mile before I turned around and headed back to my car to take it off. I ran back with the soft flask in my hand, that’s how annoying it was! I have a Nathan backpack which I love but don’t really need the larger bladder for marathon training so wanted to try something lighter. So disappointed!"