www.liquidcontainment.com/fuel_bladders.php
You will get a few 5 ltr containers for the price tho.
MSR and Trangia make aluminium bottles that are just short of a litre if you want to store multiples of them and are generally available at camping stores. Also pretty expensive.
cheers Surly
A bit more info on the bladders. http://www.liquidcontainment.com.au/fuel_bladders.html http://www.liquidcontainment.com.au/ecommerce.php?action=search&category_id=26
When I rode down for the pub run, the mate that was with me put some fuel in a coke bottle for the Glendambo to Coober Pedy stretch (256km). The fuel in the bottle expanded due to heat and leaked through evrything in his saddle bag. Gloves, shoes, clothes, Chrissy presents etc. Not a nice experience. Ensure you get a 'fit for purpose' fuel container and think about heat and expansion issues.
I reckon the bladders are the way to go because they don't take up any room when not required.
IMHO
You just have to be careful with contamination and condensation, plus the fuel going off if left a long a time in the container.