I do have a regular flint-n-steel, got it at the Piek Market in Seattle about 20 years ago. Actually it's a magnesium bar set in a cedar handle. There's a strip of flint epoxied to the magnesium, and a 2" piece of sawblade attached to the handle by a thong. Works great. Shave some cedar off the handle for starter, shave some magnesium to mix in with the cedar, it'll burn hot no matter what.
But if you're goal is to go lightweight, you know the anwser- it's the sparlite for sure. Weighs a fraction of an ounce