Whether the rum is opened or unopened, rum should be stored in a tightly sealed bottle in a cool, dry place that is away from any radiators or direct sunlight.
If the bottle is less than half full, and you don’t plan to drink it for a few weeks, we recommend pouring the rum into a smaller bottle. This is because the rum reacts with oxygen, so the more space there is in the bottle, the quicker the rum will deteriorate in taste.