When storing books, the choice between cardboard or plastic boxes depends on the storage conditions and the level of protection required. Cardboard boxes are breathable and cost-effective, making them a good choice for short-term storage or climate-controlled environments. However, they are susceptible to moisture and can attract pests. Plastic boxes offer superior protection against moisture, pests, and dust, making them suitable for long-term storage or in less controlled environments. Ensure that plastic boxes are not airtight or use desiccants to prevent moisture buildup. Acid-free cardboard boxes may be the best option for valuable or antique books to avoid damage over time.