Carry all in comfort.
I participated in an Adventure Sprint Race with this pack. I wore it for 9 hours paddling, running and biking. I never felt it on my back. I had a PFD strapped to it most of the day and all my gear, including food, were carried with ease. I would definitely recommend this pack to anyone who is making day-long treks of any type. It is durable and very versatile. The water stayed cool all day except the small amount in the tube exposed to the sun but a few sips and that was gone quickly enough.