I bought this in the fall of '24, but it's remained unused as I haven't gone out. I'm selling it to declutter. A 750ml THERMOS water bottle, specifically for mountain use, capable of maintaining temperatures up to 78°C. - Brand: THERMOS - Model Name: ULTIMATE INSULATION - Capacity: 750ml - Intended Use: Mountain use - Maximum Temperature Retention: 78°C Thank you for looking.