Tubs OK for holding saltwater, temp housing for corals and fish during tank transfer?

[JoJosReef]

Got a bunch of these for garage storage. I know most people use Brute cans to make up lots of saltwater, but I only have one 20 gal Brute. Would these be strong enough to hold 20 gal of water each?

Further, presumably, they would be OK to hold rocks/corals while getting the tank transfer (from a 40 gal breeder size to 4ft 83 gal size)? Fish maybe?

 

[Dragen Fiend]

Yup totally fine. These are made from polypropylene.

Edit: Also to add I've not used these for saltwater holding. But I have used them as DIY hydroponics. So it holds water fine.