In reply to anthonyecc: i can vouch for the jetboil being very very quick and a canister although small lasts a long time due to the boil time being so quick.
size is around that of a nalgene bottle but you only need to take a spork and your done!,very light to carry and you can brew up/cook with the entire stove in one hand (better someone else is driving though
only draw backs are the fact that you are limited to what you can cook properly pasta,noodles,soup cous cous etc are fine but you couldn,t knock up a sunday lunch !!
all in all perfect for car,bivvy,wild camp and brilliant for multi day climbs.
jas