If you are only looking for a few more litres how about a plastic petrol can, robust and cheap.
I had a fuel range problem in the Turkmen desert and ended up with about 10 drinks bottles strapped around the bike. Effective but you do feel a bit like you're riding a flying incendiary
p.s msr bottles are the ideal storage for duck tape and jubilee clips - both of which I swear by for on the road repairs
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