i use the reels of yellow floor marking tape, it gets "liberated" from work and so is very cheap. i don't carry a whole roll, i stick it to the backing sheets of waxy paper from large adhesive labels, also robbed from work :-D to fix a burn hole in a goretex jacket, cut a slit in the mesh lining, and apply tape to the ptfe membrane from the inside. works a treat! car keys are also a vital piece of kit. i have a magnesium fire starter, small led torch byprincetontech and a couple of other bits attached. cheers, and.