The 10 Commandments of Self Storage Use boxes that are a uniform size – they will stack much easier and utilize space better. As you stack, place heavy boxes on the bottom and lighter on the top. Leave walkways between boxes so you can access them easier. Half full boxes tend to collapse easier during stacking. Leave a little space between your unit walls and boxes – helps air circulate Storing a refrigerator or washer/dryer? Leave doors slightly ajar – prevents mold. NO flammables or combustibles allowed in any of the storage units. Photo or Video documents your stored items. Label your boxes for quick ID. Bubble wrap and newspaper fragile items.