I have occassionally carried a 100oz Camelback, two 1 quart canteens, two 2 quart canteens and one 5 quart water bag (and a lot of other stuff) with relatively no problem. Let's see that's: 100+(2x32)+(2x64)+(5x32)=456oz of water, which is about 3 3/4 gallons. That's about 30 lbs. Right? That doesn't sound right....<br><br>Anyway, it's heavy, but doable.<br><br>Andy