What size cage should I keep 8 feeder mice in?

If you would tell me that would be great! :DWhat size cage should I keep 8 feeder mice in?
40 gallon or a 48 x 13 cage. (Play around with those measurements if you want. The more floor space the better.)What size cage should I keep 8 feeder mice in?
if you want the mice to be big keep them in a prety big tank. if they are going to be fed to a snake soon and you dont want them to be big just keep them in a contanier like the size of a box after ice pops.