I bought this to serve as a higher capacity alternative to my Nathan vapor air (sz S/M for which I absolutely love). I purchased the size small based on the size chart as well as discussing with sales staff. Supposedly the pack runs slightly large. My measurements- 6ft tall, 150lbs, very fit runner build, 39in chest, 33in bottom of ribs. I had two major issues with the pack- 1. The pack was way too small for my build. I realize it should be snug, even very snug, and that is how I like running vests to fit but I can barely get this on and it is effectively unusable. 2. The volume is 11+ liters ...
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