Me too, but just one of them.2 or 3 of the 7 gallon Reliance aquatainers.
So far 10 years with no issuesWe once had those Reliance containers and they were crap. Some wore holes in the bottom. And leaked from the top vents if knocked over, or just when the sides were squeezed by other gear. So, after wasted money we finally got smart and got LCI/Scepter jugs, and they are SOOO nice. We mod'd a couple for air pressure pumping, but mostly just use gravity. We have corny kegs as well, but the rectangular fit of the LCI's seems to fit where we want them better.
We've also started using a couple of 4 liter baritainer jugs for easily accessible water; they're square and pack easy.