That is slick, but there's a few things that scare me about it. I would rather have an entire cage that opened up as opposed to just a strap holding the can in place. Secondly... i wouldn't want a screw type can under my rig or even a NATO under my rig in case of leakage. I know i have had plenty that do not leak.. but i'd be paranoid the whole time. "If" i did ever do this i'd at least use metal cans instead of plastic. Just in case there was something in the road that protruded into the cage area. That's just my $0.02.
I still think it's a great idea.. i just wouldn't feel comfortable with it.