wds, your aren't refering to anything from the barrel guy? are you? you mean the regular storage tubs from walmart and places. true those are not meant for lifting or transporting heavy fluid load. and sag a lot when full.
Barrel guy usually has the big 50 gallon blue poly, or white poly food grade barrels with lids. industrial strength. meant for shipping fluids. and it sounds like other rectangluar heavy duty poly tubs that might make good sumps or shallow grow tanks. and large, 170-330 gallon water storage poly tanks. according tohis advertisement. I talked to him once last year, thinking of getting some. but never drove out there. I would like to see what other stuff he has.