Vacuum Insulated: Keep your drink cold for hours with the double-walled, insulated stainless steel water bottle for kids. Leak Proof Straw Lid: Our BPA-free straw lid is leak-proof when the nozzle is in the closed position. Cupholder Friendly: The 10oz-22oz Summit water bottles fit in most cup holders. Not intended for Hot Liquids: Pressure may build in the bottle causing leaks or spills. Not for children under 3 years old. US Patent Pending