I just have to say, this thing is amazing, I filled it up at home, and when I cam back after 4 days, it still had about a half gallon left in it.
Kept my boots and waders clean, made washing the Chili Pot a breeze, and I did not have to use my drinking/cooking water! Leave it in the sun for a couple of hours and the water gets hot.
The only problem was that I left it out at night and on the last morning it was 24 degrees!
The water in the bladder was fine, but it was frozen in the hose, this can easily be fixed by putting some insulating material in the lid/stowage compartment.
Anyway, it will now be part of my travel gear!