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. The Big Sipster Spill-Proof Cup, like all Playtex Spill-Proof Cups, uses the patented SipEase One Piece Valve: 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 leak-p[roof straw bottles. With valve storage feature - no losing valve in the dishwasher! Big Sipster Cup with SipEase one-piece valve lid. Valve stores under lid. Made in the USA.