Love it, but it takes a little getting used to. - Marmot Kompressor Rush

I really like this pack, it is exactly what I had hoped it would be. It works exactly as it is intended and it is well constructed.

It does take some getting used to. I found that it is a little on the bulky side and if it is not positioned right on the waist it was making it difficult to breathe while running. Once I positioned it lower on my waist it fit fine and didn't move about as much. The other thing, which is only hinted at in other reviews, is that the water bottle will fall out if you have drank half or more of the water (I had to backtrack two miles to find in on the first run). I found that if you re-inflate the bottle with air after drinking it maintains enough rigidity to stay in place. However, this defeats the purpose of having a flexible bottle because now the water sloshes about. With 500 mL capacity though it is doesn't make a noticeable difference.

This review was written in the old system and had content requirements that are different than reviews written today.