These bars will be fine in an airtight container at room temperature for 2 or 3 days. After that, they tend to get soft. If you want to keep them for longer, store them in the freezer for up to 6 weeks. Wrap each one individually so you only have to thaw as many as you want to eat. Whichever method you prefer, it’s important to use an airtight container, or else they will go soggy.