A bow saw blade is definitely more packable than a bow saw en toto, but how easy is a bow saw blade to use without the ability to make a frame for it? The chainsaw I carry can make into a bow saw in the field almost as easily as a stiff bow saw blade can be, but is also just as useful without a frame to attach it to, and still much more portable than a stiff blade in a survival pack would be. I have and use stiff blade saws on everything from my Leatherman Wave to 30" bow saws and I claim that my little pocket chainsaw is just as effective as the big bow saw with frame and all, and even better in some cases where clearance is an issue, and definitely the most portable saw I own. I don't understand why it receives minimal consideration considering how functional it is in a survival situation.
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The ultimate result of shielding men from the effects of folly is to fill the world with fools.
-- Herbert Spencer, English Philosopher (1820-1903)