RE-USE PLASTIC BOTTLES! This hummingbird feeder attaches with a suction cup bracket to an outdoor window. They are so simple to assemble. Just fill an empty plastic or glass 16-20 oz. Pepsi product soda bottle with nectar (sugar and water), twist on the feeding base, and attach to a window. Now you can lure these illusive little birds closer and enjoy the view. MADE IN USA Each kit comes with a red feeding tray, yellow feeding perches, and a window bracket with suction cup. Soda Bottles not included. The best bottles to use with this feeder: Pepsi product bottles with thicker plastic. Bottles with thinner plastic could collapse when filled with water or nectar. Sparkling ICE bottles and Heinz Vinegar bottles also work well, too.