I got a deal with these. They are commerical food grade (Pickles came in them) barrels. They come in 55galon, 5gal, 10gal and 30 something sizes. They have the "O" ring on the inside and they are pressured washed out very good. Mainly when I ask the guy that sells them he tells me where they came from and what was in them. I would think they are about the same as gamma buckets (whatever the hell that is) and you can use them for long term food storage or putting stuff that you want to burry or whatnot. I didn't know they existed until I started asking around for them in my area at resturants and then I found them everywhere. I got some for rain catchment as well. Very cheap. Check yellow pages for commercial food stores and check craigslist because I seen some in my area on there, but beware of someone doulbing the price (price gourging) you with them since you can go straight to the source.