JD Diver makes an excellent point.

Many charities need such donations of coinage more than I do. I fly quite a bit and see various Red Cross and other relief organizations along the way, and I give them all of my coinage.

Years ago when I was flying positive space or stand-by, I believed that if I made a donation, I made the flight. It did seem to work at the time.

One less item to fall all over the floor when security says " Please empty your pockets, before stepping through. "