No, you can carry more than a gallon- I've loaded my packframe with a 5 gallon water cube, strapped/clipped/ducktaped a small pack on top of that, and packed water into campsites without any real difficulty. Although, I was porting the main water supply for a group, and it was only a three hour hike in. <br><br>Realistically, you can carry 2 gallons easily in a good pack- it's only 16 pounds (~7kg, a little more). And it isn't that hard to do if you put a 1 quart/liter bottle onto eachside, then three two quart military canteens in the body of your pack. It sounds like a lot, but that's normally what is in my bug out bag when I rotate out the winter gear in April/May, and for camping in the summer. Past few summers, my area has seen some heavy droughts, and easily half the people in my area have had thier wells/springs either dry up or get low enough to have to go to spounge baths and other concervation measures, with ponds and streams that have run steady for a hundred years dry into nothing.