I got a black plastic husky 50 gallon rolling tool box for all my dive gear. Its has groves in the lid that my tank rack can slide into. Ive been through 3 duffle bags, and two other plastic containers (27 gallon and 50). This is the best way to carry all of my dive gear on my boat, or truck and to the dive site. Im not strong enough to carry a bag and would rather be able to roll it.
You got a picture to referencr to on how to lock the tanks down.