I have about 10' of paracord wrapped around my PSK and I would think that any formation of knots or bundling that actually held that much paracord would be about twice as large as your keychain and might be a bit of a bundle to carry that way. For any usable length of cordage that is reasonable to carry attached to your keychain you might want to think about a smaller diameter cord. Sure it is less strong but you really don't need 550 lb test cord to guy down a garbage bag shelter which has a tensile strength of about 1.5 lbs. something like a 20' length of 60 lb. test nylon cord might be much more usefull and still fit in a tightly wound bundle on a keychain without much more than doubling the size of the keys themselves.<br>Just a thought.