Several of 1000 Uses for Old Bicycle Tubes

Step 5 MP3 Player Battery Door Closure

Yup, the little door to the battery compartment of my MP3 player is busted; therefore, no tunes.
So, a slice of inner tube to the rescue. Stretched from end to end, the slice provides plenty of tension, and keeps the battery door closed, and doesn't interfere with the controls. Therefore, tunes return and we are happy.