Those ones dont last. I did that, coming home from Canberra last year and I grabbed around 8. Anyway, i lost a few, stuffed another couple and I was down to my last 2.
I was waiting to get on the bus with my mate to go to Perth for state titles and had one earphone in, and was twirling the other around my finger and the end literally just flew off. I wasn't swinging it hard, nice a loopy roll, and it flew off.
So I whipped out the other pair and then about 2 minutes before we got to the hotel, the other pair just stopped working. One second it was playing normally, the next I had no sound.