I have used the commercial containers you mention extensively over the past several years, primarily on trips to the Channel Islands. My experience has been that both the one gallon and 2 1/2 gallon containers are too fragile for any critical use. We often checked with the supermarket staff and obtained our 2 1/2 gal containers still in the cardboard shipping container, two per box. Tthey travel much better that way, although you are looking at about a 43 pound package.<br><br>Much better are various gallon containers for fruit juice and Gatorade which are much sturdier. These recycle very nicely. For larger sizes I have broken down and bought commercial containers - these sometimes have features (like plastic spigots) which justify the extra expense. I stay away from anything over five gallons if I contemplate moving it. A three gallon container is much better for portability, at least for me.