I saw this case at my local computer store, NCIX, for about $17. It looked like it could hold 3 radio transmitters and sure enough it could. It fits like a glove. I’ve seen similar cases designed to hold 2 transmitters and it 5x the cost. It even comes with a strap and a crude lock that a toothpick can break open. Inside there are 2 movable dividers so you can adjust it to fit your gear. It measures 40w x 22d x 27h. It can hold 3 transmitters of various sizes. My biggest radio, a pistol-grip GT3, fits easily.
I usually take my DX6i and FS-GT3 with me in one of the cases. That leaves one compartment free for batteries and other stuff I might need when I’m out on the field. I have a few of these cases to hold all my transmitters. I use to have the loose on the shelf and they were like expensive china waiting to be broken.
For less than $20, they are great cases for all your gear. You can afford to get lots of them.
Here’s one from JR that costs $84.99!