One of my readers came across an item on one of my favorite gadget-sites, and thought I should know about it. Turns out, I already have one, or similar at least, but I thought it apt to tell you all a bit about it too. This is a Wire Saw. For those of you who have never seen one, it is a strand (or strands) of wire with some form of edge cut into it. Mine has a spiraling ridge that is cut into the strand running the length of the high-tensile wire. I have also had one that had circular grooves cut into the entire length of the wire, (confiscated by airport security somewhere...). The way these are used is to drape the wire over the item to be cut (wood, plastic, soft metals, bone, whatever) and by tensioning the wire with the rings, cutting by drawing it back and forth.
Because it's a flexible tool, and includes the split rings at each end, the length of draw can be extended by adding cords, which can even enable you to cut overhanging, out of reach or hard-to reach spots. You can also fit it to a flexible pole to make a bow-saw. The offering from Zazz has a multiple strand wire which is probably more sturdy and lasting, as well as giving a better bite and cut. I've used mine to cut a dangling broken branch as thick as my forearm which was blocking a CFA water-truck whilst at a festival, much to the volunteers delight, to rough-cut 2x4 planks and to put notches into poles for lashing purposes. Never a problem with cutting, no failures. Bear in mind this isn't nearly as bitey as a proper toothed sawblade, or a chain-saw (even the manual kind, thanks to Ken of Modern Survival Blog), but its light, packs to nothing and won't cut your gear even when stored haphazardly.
One of these features in the Bear Grylls' Ultimate Survival Pouch that I reviewed a while back, and I can't recommend them enough to anyone who adventures in the wide and wild outdoors, wants to be ready in case of disasters, or perhaps just wants to look like a bad-ass zombie-decapitating mall-ninja! I keep mine in my messenger bag, I'll let you be the judge of my mall-ninjaness.