We have used the backpack at a 80km hike. The hydration system is sufficient for the daily ration of water, for the most necessary luggage for 2-3 days is also space. The comfort is very pleasant and thanks to the cooling technique of the backpack you sweat almost not at the back, but only just below the carriers. The water remained despite 30 ° C comfortably cool in the bladder. Definitely worth the money.