It's very comfy! Tried it our for a road run... I just find the front water bottles heavy and the water sploshing sound distracting... Haha. Maybe ill just buy no-splash-sound flasks. Love its lightness.. . Could use some fit in my chest section. Cant wait to try it out in the trails! Thanks for the offer, Chris Sports! And for the product, Ultimate Direction. Im a fan of your athletes! Esp Jurek and Kelly!