What is a "collins glass"?

A collins glass is a tall, narrow drinking glass typically used for serving cocktails, particularly those that are served over ice and topped with soda or another carbonated mixer. It is characterized by its elongated, cylindrical shape with straight sides and a capacity of around 10 to 14 ounces. Collins glasses are commonly used for classic cocktails such as the Tom Collins, John Collins, and Vodka Collins, as well as for variations and other mixed drinks. They provide a stylish and practical vessel for serving cocktails, allowing for ample room for ice and mixer while also showcasing the drink's colors and garnishes.