Hi,
Here's one I made cheaply.
6" underground drainage pipe, end cap glued on one end with the top cap drilled through.
I used drilled threaded rod through the end cap with a padlock.(this was cut off at some point on the trip even though I had asked if it was ok to lock it)
I used cable ties to secure it on the way back, with spares taped on in case they opened it again.
I glued mouse matt inside the 2 end caps and twisted rope for handle and shoulder strap, tied between the ribs.
My recurve fit in nice and snugly with the limb tips touching one side and the limb savers touching the other holding it firmly.
It got to Colorado and back from the UK.
Make them any size you want.
Hope this helps, Andy.