My 1 qt wide mouth mason jars set nicely on top of the inner cover hole, covering the hole completely. They fit inside an empty medium super, with a telescoping top cover. I drilled five 3/32" holes in about a 1" square in the center of the lids. My new pkg bees took 1 quart a day for the first few days, then tapered off. When I inspected for queen release on day 4, all hives had several outer frames heavy with syrup, less towards the middle - as you might expect.