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I use a buck saw that collapses completely in a tube.
pic related.
The blade itself was shitty and i couldn't find a good one in the required length. So i bought a big blade, cut it in half, drilled holes in it and put a nail in the holes to secure it.
For better grip i put some hockeytape on the tube.
i really like it. At first it takes a little longer to set up, but when you're used to it's a great tool. The packsize is perfect.