I while back I ordered some thick kevlar thread, thin spectra thread, and heavy duty kevlar/stainless steel thread. Admittedly I love gadgets and I partly ordered them because they are high tech and state of the art, but they are about as strong as you can get and this strenght makes them versatile enough for other uses(i.e. fishing line, snares, perhaps even shelter building). I wrapped some of each around a rectangle of cardboard that I cut out of a tissue box(folded twice, glued together except for one side), stuck 2 needles at one end of the cardboard, with the folded side blocking the points. Makes a very compact and functional sewing kit. It sits in my repair kit along with safety pins, rubber bands, some thicker kevlar string, duct tape, and super glue. The whole thing is slightly larger than one of the original iPods(most of that volume is the duct tape, one of the prepackaged flat rolls you get at ems).