Humidty that may get trapped could be the most problematic. Using pastic tubs is usually not recommended for long term storage. In this case it is probably your best bet ( for the few months) if you take some humidity precautions. You can purchase those small silicone/silicate packages you often see in the shoe boxes( they always say "do not eat") . They use them to obsorb humitity during shipping. You can purchase them from various on-line sources.