The safest place to store a melodica is in its case. The case will help you keep the instrument from dirt, dust and other mechanical damages. Most instruments come with a soft carrying case. However, if you want better protection, it is better to get a hard-carrying case. Such a case will protect the instruments. Also, make sure you store the instrument in a dry place. The temperature shouldn’t be too high or too low so that the material of the instrument does not get damaged. Being a wind instrument, melodicas are very sensitive to temperature changes.