Electrical tape or duct tape works well.
My on the bike tool bag gets switched from bike to bike and things get lost. The last time I broke a chain was climbing a hill to a camp ground, with only 10 miles left for the day. So I get my tool kit and SURPRIZE! the pins are missing. So I shorten up the chain a link or two, and press the origanal pin back in. Thinking to myself "That should hold" I ended up putting the chain back together two more times before getting to camp.
So I have started keeping a power link in the tool kit, and on my touring bikes I put another in a small bag with spare nuts and bolts stuffed in the handle bars with the spare spokes and nipples.
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Bentbaggerlen
"When the spirits are low, when the day appears dark, when work becomes monotonous, when hope hardly seems worth having, just mount a bicycle and go out for a spin down the road, without thought on anything but the ride you are taking." - Arthur Conan Doyle