I generally use the two liter pop bottles. They are as light as are the Platy's and a lot sturdier and cheaper. I just cut them up as they are emptied to reduce volume unless, of course, I will need the container again. You can also find one gallon, square containers of, I think, Arrowhead water in a lot of groceries. I have used these on occasion. I have had too many leaks from the collapsible containers to rely on them in the desert.