Usually, each plastic container has a number at the bottom (it is a triangle with an arrow and a number inside the triangle). If the number is "05" or above, it can be reused in a loop; If it is less than "05", that is, "04" or below, or even without a number, please do not reuse or heat it up for use

1. Preheat or pre cool with a small amount of boiling water (or ice water) for 1 minute before use to achieve better insulation and cooling effects. 2. After filling the bottle with hot or cold water, make sure to close the bottle tightly to prevent water leakage and burns. 3. Excessive use of hot or cold water may cause water leakage. Please refer to the water volume location diagram in the instruction manual