Right now I have a military web belt set up with two one quart canteens. There is enough room between them for my 2 quart canteen If I want to carry it too. I also have a camelback style 2 liter style water carrier but wouldn't want to carry that if I had the versapack. It I had (or get) the SS bottle, either the 40 or 64 ounce, it would go on the web belt and if I got the 64 it would replace both the 1 quart bottles.