I made one of these paracord bracelets, with a fastex buckle from ITW Nexus that has a built in whistle. I don't like bracelets, so I made it large enough to fit around my calf just above the top of the 10" Matterhorn boots I normally wear. Gives me proabably 11 or 12 ft of paracord, and a whistle, all rolled into one...