Material: Food-grade 304 or 316 stainless steel
* Insulation: Double-wall vacuum insulation
* Capacity: Common sizes include 500 ml, 750 ml, and 1 L
* Temperature retention:
* Keeps drinks hot for 8 to 12 hours
* Keeps drinks cold for up to 24 hours (varies by model)
* Leak-proof: Yes
* BPA-free: Yes
* Wide-mouth opening: Easy to fill with ice and easy to clean
* Portable: Suitable for travel, office, school, and outdoor activities
* Detachable cup that can be used as a drinking mug.