Fruit Fly 32 oz. Insect Culture Cups (20 Pack) with Vented Fabric Lids You get (20) 32 oz. Translucent Round Containers and Vented Fabric Lids Perfect containers for Fruit Fly Cultures and Worm cultures. Each cup is constructed of food-grade plastic. The Cup lids are vented with a chew-resistant fabric to keep insects in, while providing vital air circulation. Also available in 100 Pack.