Fits in most car cup holders. The Big Sipster Spill-Proof Cup is designed for older kids: Larger liquid capacity 10.5 ounces; Easy grip shape for kids on the go; Comes in bright colors and fun designs that kids love; Eliminates messy spills; Easy to activate - liquid flows easily when child sips; Easy to clean. Playtex Cup Lid: Interchangeable with Playtex spill-proof cups and leek-proof straw bottles; With valve storage feature - no losing valve in the dishwasher.