tub size for mice

what size tub does everyone use for grow-out tubs for mice?

I have about 26 babies who will be due to be separated here in the next week and I'm wondering what size tubs I should buy to put them in until they reach adult size.

I plan on having one for boys and one for girls.

I use large Van Ness Kitty litter pans 18 3/8" x 14 7/8" x5" (Only keep about 20/25 mice in each tubs)