I havnt tried this but it seems like a good idea in theory. Take a length of 550 cord (say 10 feet) and tie a knot at 1 foot increments. If you want to measure something, like the other day I wanted to measure a piece of furniture at office depot, you can easily know how many feet something is. As for how many inches, it should be simple enough to bend the final 1 foot section in half or quarters. Basically lets say the desk is 5 feet and 3 inches long. If you took the 550 cord "measuring tape"' it would have 5 complete 1 foot sections and a small bit into the next 6th section. If you take the 6th section and fold it in half (just line up the 6th and 5th knots) then you know what the 5 foot 6 inch mark is. If you fold that section in half one more time, you know the 5 foot 3 inch mark. I havnt done this in reality, only in my head but I imagine you can estimate to the nearest 3" ( 1/4 foot) this way. I wouldnt want to keep folding it because then it would get too messy and inaccurate but for the purposes of a blunt measurement, it should work. Then take one of the cool mini clips from Berkeley Point and attach it to one end so you can attach this to the end of something you want to measure. Also clip it to your belt or keyring. Tie the cord down in a daisy chain to quick release it when needed and the overall length chained up will probably be a few inches only by an inch diameter. Should make a decent keyring FOB since I used to use a similar length piece of 550 cord daisy chained into a small cool looking helix - however the 11 knots may impede the creation of a tight daisy chain. I am probably going to try this with the spectra cord I recently ordered from Berkeley Point as its thinner than 550 cord (its only 2.7mm thin). Of course it makes much more sense to carry a mini tape measure if you do a lot of measuring, but I do not, and the cord is multipurpose, obviously and you can make a new "paracord measuring tape" in a couple minutes if you needed to use the one you carry for rope work. On further thought it might be better to mark the 1 foot sections in some sort of ink so that you dont have to unknot the 1 foot markers if you need to use it as cord, but 1) the ink might fade off over time, 2) for the purposes of pocket cord, you probably can use it with the knots every foot for whatever purpose you need provided it isnt load bearing since each knot reduces the strength of the rope by a substantial percentage, effectively turning the 550 cord into "50" cord after you have a dozen knots in it.