A tumbler is a type of drinkware, typically a tall, straight-sided container, used for holding beverages like water, coffee, or iced drinks. Tumblers come in various materials such as plastic, glass, stainless steel, and bamboo, and are designed for both casual and everyday use. They often feature wide openings, making them easy to drink from, and some are equipped with lids and straws, making them spill-proof and ideal for travel or outdoor activities. Many tumblers are insulated to keep drinks hot or cold for extended periods, making them popular for on-the-go hydration.