Zojirushi flasks (also known as vacuum insulated bottles or thermos flasks) are premium, stainless steel containers designed to keep beverages hot or cold for extended periods often up to 24 hours. They use advanced vacuum insulation technology and are known for their sleek design, leak-proof lids, and durability. Ideal for tea, coffee, water, or even soups, these flasks are popular among commuters, students, and outdoor enthusiasts who value temperature retention and portability.