STRAW LID: Suitable for Hydro Flask wide mouth (12oz 16oz 18oz 20oz 32oz 40oz 64oz). For other brands of water bottles, such as Rehydrate or Waterault, only bottles with a mouth diameter of approximately 2.36 inch/6 cm will fit. NO LEAKS: Rubber gasket ring keeps your bottle sealed and prevents leaks. Maintains the temperature inside your water glass normally, please check the size carefully. EASY TO DRINK: Pop up the mouthpiece with ease and versus unscrewing and tightening the regular lid every time. Clean and hygienic, so you don't have to consciously drink more water. SAFE MATERIAL: The water bottle straw lid is made of food grade PP and TPR material. BPA free, odourless and safe enough for you and your family to use. MULTIPLE OCCASION USE: Perfect for outdoorsmen, hikers, hunters, athletes, campers and other outdoor sports, the straw lid is specially designed for one-handed drinking.