Safe Travel Tote For Frogs?

[Cliygh and Mia 2]

I've used "Kritter Keepers" for the same thing for smaller species and it worked fine, sometimes for the larger ones it served well for permanent housing for smaller species (Single Fire-bellied toad for instance), but granted I don't know if your bullfrogs could/would stay in one for an extended period of time just due to their size. What about storage boxes? Some of them are fairly large (Like 50 or so gallons), and they're pretty cheap to go and buy at places like Walmart and Target