Stainless steel Thermos Vacuum Water Bottle Flask.

Features

• They are made of stainless steel and feature a double-walled construction with a vacuum between the walls to prevent heat transfer.
• These flasks can keep liquids hot or cold for 12 to 24 hours.
• They are suitable for travel, outdoor activities, offices, and home use.
• It's advisable to avoid filling them with carbonated beverages, acidic drinks, or hot milk.
• The silvered surfaces inside help to minimize heat loss by radiation.
• A tightly sealed cap prevents heat loss through convection.
• They are durable, BPA-free, and easy to clean.