Dental floss is a very strong and versatile item for your pack. Carry it and a needle inside the top cover and you have a great repair kit. Use it to sew a button on a shirt or coat, mend a boot, or mend yourself (dental floss is sterile and very suitable for stitching up a wound). It can be used for a multitude of purposes, is light, easily contained, and, yes, you can even use it on your teeth!
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