You’ll have peace of mind with Thermos. The lunch jars, sippy cups, and straw bottles are made of vacuum-insulated stainless steel inside and out. The plastic valves, spouts, straws, and lids are BPA free. Liquids will stay cold for up to 6 hours. Hot foods will stay hot for up to 5 hours and cold foods will remain cold for up to 7. Freshness and safety go hand in hand with Thermos.