I do know they are relatively expensive compared to a 5 gallon gas can from Lowe's, but they can be mounted vertically and horizontally, and with a locking T-handle, will do a good job at resisting theft (it is likely a removal attempt without the key would damage the fuel containers to the point where they can't be used.)
Anyone like/dislike these containers? I wonder if they are worth the expense, because I plan to carry them on a hitch mounted cargo rack. That way, I can carry around 10-20 gallons of extra fuel to feed the generator if the weather turns too hot/cold, and the locking handle will go a ways to keep honest people honest. I also plan to see about using security screws/bolts to ensure that the pack mounts can't easily be wrenched off.