I have those exact buckets at home.
I have seen a guy drill a hole in the lid the perfect size for a blow off tub...then the airlock.
Works really sweet for holding grain.
Just make sure you rinse them out
really well. I ran the lid thru the dishwasher just to be on the safe side.
If i could find a gasket to go inside the lid, I would love to make a secondary out of them. But one project at a time.
As for the durability of the bottom...I guess i depends on how old the bucket is, and if it sat outside... The weather will make them more fragile.
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If you grow a garden, Anouther sweet purpose for the buckets is drilling some holes in the bottom and planting potato's in them.
I did that this year and had really good luck with them...Was easy to dump them over and get the spuds...downside, Have to constantly keep filling them with dirt. Search youtube for bucket potato's...Really big over the "pond" britain per say... Not much space over there for a garden i guess.
Guess you could also make a bottleing bucket out of it, Guess the possibilitys are endless with enough creativity.