Drosophila vials, also known as fly vials, are small transparent containers used to hold and culture fruit flies, particularly Drosophila melanogaster, in laboratory settings. They are made of high-quality plastic or glass and come in various sizes to accommodate different experimental needs. Drosophila vials typically have a narrow opening and a tight-fitting cap to prevent the flies from escaping while still allowing for air circulation. They can be filled with a variety of media, such as agar or molasses-based food, to provide the flies with necessary nutrients and a suitable environment for growth and reproduction. Drosophila vials are a critical component of genetic and developmental research and are widely used in studies related to evolution, neurobiology, and disease.