We are planning on going to a 30l 2 barrel system but it raises one primary question for me.  How do you insulate your cold stuff?  If you just use a plastic barrel it would seem that not only would it sweat a lot but also it wouldn't last that long.  I was considering using one orange barrel of the type you susually see at sporting events for liquids since they are insulated.  Has anyone done that and is there a harness that would fit that if I want to take just one?