Keeps water and other liquids hot for up to 12 hours and cold for up to 24 hours. On a hot summer day, you can add ice cubes to boost cooling and hydration. Capacity and portability - Size: 17 oz, easily fits in most bags or backpacks. Material and performance - Material: Outer and inner walls are BPA-free food-grade 304 stainless steel. - Design: Leaktight construction; you can turn the bottle in any direction without leaking, helping to preserve temperature. Appearance and practicality - Style: Solid color design with no branding or pictures; suitable for all ages. - Packaging and transport: Well packaged and easy to pack, making it convenient for daily use or travel. Gift-ready - Versatile gift option: Suitable for anniversaries, birthdays, holidays, Christmas, Thanksgiving, and other festivals; a practical present for family and friends. Use scenarios - Office or school: Keeps coffee or tea hot on your commute, or water cold for long study sessions. - Outdoor activities: Ideal for hiking, camping, picnics, or trips where maintaining beverage temperature matters. - Travel or errands: Lightweight and easy to carry, supporting hydration on long days out.