The XXL version will hold 20 gallons. Ye gods! That's a lot of beef stroganoff!

Silliness aside, I've used the smaller ones for waterproofing (cell phone, TP) and food carriage (fig newtons), so I'd reckon the 3 and 10 gallon units would work just as well. Actually, it's a brilliant idea.

I've always wondered how these would work - would have to balance the re-usability against the cost, I'd think.