100% LEAKPROOF FLIP CAP*: LeakProof Flip Cap is your new go-to for hiking, school, work, gym, or throw in your bag without any worry. *Leakproof when in locked position EASY SIP CHUG & STRAW LID: Drink directly from the vessel with the integrated chug spout, or use the detachable straw for convenient sipping. The lid locks shut to prevent leaking when traveling. CUPHOLDER FRIENDLY: Cupholder-friendly design feature a contoured, comfortable easy-carry handle. EASY TO CLEAN AND DURABLE: Dishwasher safe and BPA free Parts. Durably designed for everyday use.