I had to keep Lunch in a 1 gallon bowl for about a week, and the cats really wanted in! My daughter got a new tent for Christmas, and the old one was trashed, so I cut the black netting off the side of my daughter's old tent, stretched it over the top and put electrical tight strips (you know, for keeping cords in a bundle) around the top nice and snug.. then to make it look nice, I wrapped black lace around the tight strips and tied it in a bow. Lunch was Gothic Lolita for about a week.. hubby kept making fun of him for his frilly dress. But it kept the cats out and let air in, worked perfect. Was kind of a pain to cut the strips every time I had to change the water, though.