I use moving boxes. Two Large Fowl per box for a large box so two boxes. Put some pine shavings on the bottom.
Oh--then I didn't need to ask local folks on FB for a dog carrier--I've got empty fruit boxes, and even have cardboard to block the big hole in the bottom/top. I was just going to use shredded paper instead of pine shavings, though, 'cause the paper's free.

