Ok, thanks for posting this thread up. It has made me look at my gamma lids (in advance of a MFS trip).
Oh Boy! I have a few of the 3 and 5 gal buckets with gamma lids that I've used for food, charcoal, sundries, etc. over time, so I wanted to convert one of them into a "lighter" weight groover. Glad I decided to test them for water-tightness to see which would be the best for the groover.... Guess what, THEY ALL LEAKED. That's probably not a surprise to anyone... but all the o rings looked to be in good shape, all lids were sealed tight. Putting about a gallon of water in them and inverting the bucket caused all 3 of them to leak from the seal almost immediately. I'm not talking about a few drops, but a nice stream.. like my dog makes on the fire-hydrant...
I thought I'd drop a few more $$ on plastics and took "rivers2run" advice and got a couple 'lip-lock" Life-Latch buckets and lids. Test re-performed with only a few minimal drops of water released. Much happier now knowing that I am not going to use the gamma seal buckets for anything real important. Especially the poo stew. As always, YMMV.
more snow = more water