Foam. You can get black foam inserts similar to the ones used for Pelican cases (Amazon.com: Pelican 1201 3 Piece Replacement Pick N' Pluck Foam Set: Camera & Photo = example) and since they're pick and pluck foam, you can make inserts in it for your mods. That's what I did for a disaster kit last year when we lost power for 10 days.
Whatcha got there?From Romania!
What is underneath the cap, atomizer, tank?
Mine? It's a VPX Cartomator from Nhaler with a Kanger horizontal coil cartomizer.