good idea,it beats a tin of stuff you don't really need
i'm doing just about the same thing for the June canoe trip.on a "coal to Newcastle" theme i have a small zip lock of Birch bark.
it was some i picked up last summer off a beach on Lake Superior and had it just sitting around my den.
with a forest full of downed Birch it seems like you would not need to carry it in but being able to pull out a hunk of bark from the food pack and put a match to it beats bashing around a wet brushy forest to find some and i think it makes a better fire starter than something you could buy.