Made from military-issue 550 paracord, Survival Straps ($18-$25) are bracelets designed to help you in an emergency. With 15 to 20' of cord used in each bracelet, you simply unravel it to instantly have a section of strong rope for any number of uses.
Make your own paracord survival bracelet. Customize it to your needs and save yourself some money. The pre-made loaded bracelets typically cost about $60, but you can buy the supplies to make about 10 or more for the same price. Update: I've swapped the regular whistle buckle to a whistle buckle with a hidden handcuff key, added reflective tape to both sides of the female end of the buckle, and added a 2" saw blade inside the bracelet.
The Scout Slimline Survival Strap: Parcord Bracelet with Whistle, Fire Steel, Knife Blade. Upgrade for p38 Can Opener, Kevlar Saw, Fish Kit. by SuperesseParacord on Etsy https://www.etsy.com/listing/244737340/the-scout-slimline-survival-strap