They're pretty much normal-sized feeders--the kinds you would see in any shop seeling feeders. I guess they hold about a pint and a half--or maybe a little less. Tonight just before 7:00 my dad looked at the feeders and said, "I need to fill them again." I asked him why so since night was falling, and he said, "Oh, they'll drink it all up." I counted nine hummingbirds working on one feeder today--just batting each other around trying to nab quick drinks.