You can store bananas in the refrigerator. The skin gets ugly but the fruit itself will ripen more slowly.You can also freeze them for later use in smoothies or baking. Peel them first, lay them on a cookie sheet whole or cut in halves. Spread them out so the pieces freeze separately. Then put them into plastic bags or boxes loosely. Maybe separate layers with a double layer of wax paper or Saran Wrap so you can take out only as much as you need. For smoothies, they'll soften enough for the blender in a few minutes.
