people use a ton of brands rubbermaid, Sterilite, Isis.

most people use the 6qt size for hatchlings, then go up to 19qt( shoe box size) for juvies, then 25qt or 36qt ( sweater box size)

if you are putting them in a rack I prefer the isis tubs because they have straight sides if you are using them as stand alone I prefer sterilite locking lids to the other brands.