Earbuds have a habit of getting tangled when you toss them in a bag. Fortunately, you can keep them organised with a standard chewing gum container.
Instructables user Kris T. shows you how it's done. I love that it keeps the headphones organised while still letting you use them. He used a bead to keep the aux jack from sliding into the box, and he can ccontrol how much length he can pull out of the other side with a paperclip.
The only downside is that you have to manually repack the spare wire once you're done, but that still beats dealing with tangles. Be sure to check out the source link for complete instructions.
Portable Container for Earbuds [Instructables]