With all the strength and function of its bigger brothers, this half-quart thermos packs easier when space is a premium. Fully leak-proof, it'll keep your drink warm and your pack dry. Vacuum insulation keeps drinks hot or cold 15 hours or iced 60 hours 18/8 stainless steel wont rust; naturally BPA-free Insulated lid doubles as cup Leak proof and fully packable. Highlights: Insulated lid doubles as cup. 18/8 stainless steel won't rust, naturally BPA-free. Vacuum insulation keeps drinks hot or cold 32 hours or iced 160 hours.