when I was young and broke, I kept the last set of strings I had on the guitar, in case I broke a string butting the new set on. (my guitar was cheap and crappy) Though I typically "wrapped" the strings into nifty litte loops, similar to how they come packaged. Once I learned that the source of my problem was burrs on the crappy tuners, I busted out a file, fixed the problem, and started cutting the floppy ends.