Originally Posted by nullzero

I have been using white plastic 30 gallon car wash drums. They are free and usually only store biodegradable liquid soaps in them. I wash the plastic drum and then cut off the top and drill several good sized drainage holes on the bottom. I then put some window screen mesh on the bottom. After doing that I spray paint the outside with gray, black, or white (depends if I want heat retained or reflection). I usually go with grey though.

The plastic is very sturdy and should last around 10 years. The container is also easy to move since its designed to be used with a drum dolly.