Precautions when using insulation bags

Be careful not to fill it too full, and the water temperature should not be too high.
Wrap a towel outside the hot water bag to provide insulation.
If you want to use a hot water bag to warm the bed, you can also place it between the blanket and blanket, and take it out when it's time to sleep.
Hot water bags also have a certain lifespan. Try not to use old hot water bags and replace them in a timely manner.