We just got this funky little tip from one of our customers, and it's a darn good one! Buy yourself a CD wallet; the type that zips up to stay closed. Instead of loading in your CD collection, use each page (which generally has space for four discs) to carry your spare guitar strings. Page one would have your low E, page 2 would hold your A strings and so forth. This way you're not fumbling with the plastic sleeve into which paper-wrapped strings usually come tightly inserted. If you can't tell which string you are looking at, simply use a Sharpie to mark the upper right corner of each sleeve with information regarding which string (and gauge) is inside (i.e. "High E .009" and so forth). You'll be amazed at how much time and fuss this saves, particularly if a string breaks on stage!