Interesting approach. Catch is that the knife I carry is very light and short. In lots of normal backpacking I find that I never need a "real knife". Given that the Coughlan saw is 2.4 oz (and one review claimed 1.4 oz) for a 3.7" blade, I think I'd rather err on the side of something better for cutting wood at need --- for dayhike emergency situations only --- rather than bring a bigger knife. With the little saw blade, an emergency fire in shoulder season trips is also a more credible option.

Besides, I've already ordered it ... :-)