tumblers

Tumblers are portable drinking vessels designed for beverages. They usually have a tall, cylindrical shape and are insulated to maintain temperature. Common materials include glass, stainless steel, or BPA-free plastics. Capacities range from about 12 to 20 ounces, with larger options available for travel usage.

Insulated tumblers often employ double-wall vacuum insulation to minimize heat exchange and prevent condensation. Many models include leak-resistant lids with sip-through openings or straw ports. Some tumblers are dishwasher-safe, though coatings or lids may require hand washing to extend life.

Beyond drinkware, the term tumbler appears in other domains. In lock technology, a tumbler is a component—often a pin or disk—that must align with the lock's shear line to allow turning of the plug. In gymnastics and acrobatics, a tumbler is a person who performs tumbling moves, as in tumbling runs and flips.

The word also appears in various mechanical contexts, where tumblers can refer to movable parts that block or permit motion until properly aligned. Overall, tumblers most commonly refer to insulated drinking vessels, but the term spans several technical and athletic uses.