As an expert sommelier and brewer, I can provide you with some insights on whether or not you can put a flask in the freezer. It's important to note that not all flasks are created equal, so it's essential to consider the type of flask you have.
In general, most flasks are not designed to be placed in the freezer. The material used in the construction of the flask may not be able to withstand the extreme cold temperatures of the freezer. Freezing a flask can cause the material to become brittle and potentially crack or break. This is especially true for flasks made from glass or certain types of plastic.
However, there are some flasks specifically designed for freezing. These flasks are typically made from high-quality materials that can withstand freezing temperatures without any issues. They are often marketed as “freezer-safe” or “freezeable” flasks. If you have one of these flasks, it should be clearly stated in the product description or packaging.
It's important to follow the manufacturer's guidelines for your specific flask. If the instructions explicitly state that the flask is freezer-safe, then you can safely place it in the freezer. However, if there is no mention of the flask being freezer-safe, it's best to err on the side of caution and avoid freezing it.
In my personal experience, I have used flasks that were not designed to be frozen and accidentally placed them in the freezer. Unfortunately, this resulted in the flask cracking and becoming unusable. Therefore, I highly recommend checking the manufacturer's instructions before attempting to freeze a flask.
To summarize, it is generally not recommended to put a flask in the freezer unless it is explicitly stated to be freezer-safe by the manufacturer. Freezing a flask that is not designed for freezing can lead to damage or breakage. It's always best to follow the manufacturer's guidelines to ensure the longevity and functionality of your flask.