Well sort of, but not quite.
I picked up one of these 1 gallon fuel bladders from Just Gas Tanks and it is a pretty nice item. It is better than the MSR fuel bottle option as it is much easier to fill, pour, and carry. It fits nicely inside my Cortech tail bag and it can easily be bungeed to the outside of the tail back with the six point nylon tabs built into the outside of the bag.
http://www.justgastanks.com/store/in...sdln8kmot9h2p7
Anyway, it might get you through until you can get the "real" MID-SIZED tank.
Out!