The bottles can be used in the freezer, it is recommended to fill the bottle 3/4 full (not completely full) to allow room for the water expand when frozen. Be aware that the bottle can be more brittle when taken out of the freezer so please void falls or direct pressure.
The memobottle is not insulated so does not keep water cool or hot for extended periods of time.
It is single walled, BPA-free plastic that is reusable, safe and lightweight. This design makes it perfect for portability, to fit in your bag and not weigh you down.