PREP & STORE WITH STYLE: 2-in-1 container designed for use with or without the prep bowl, which nests neatly inside the outer food bowl. Marked with convenient measurements for easy meal prep. TRIPLE-LAYERED & VACUUM-INSULATED: the food flask features Therma-Swell Technology and has a durable Tritan inner prep bowl designed to keep food cold for up to 11 hours and hot for up to 7 hours. HIGH-PERFORMANCE MATERIALS: durable and rust-resistant 18/8, food-grade stainless steel exterior. BPA/BPS-free inner prep bowl is fridge and freezer friendly, microwave-safe and dishwasher-safe. DRY, LEAK-PROOF & SWEAT-PROOF: the airtight screw top lid wont soak your bag with accidental spills and the vacuum insulation will prevent condensation.