The recommended temperatures for our LifeStraw products to be stored in is 33 degrees Fahrenheit/ 1 degrees Celsius to maximum 140 degrees Fahrenheit / 60 degrees Celsius.
Freezing temperatures can cause damage to the filter and purifier. The same rule would apply for hot or boiling water.
If your LifeStraw product has been used and the filter has water in it, freezing or elevated temperatures can make the water expand and damage the filter.
If your LifeStraw has frozen after use, you should not use it.