There are many conditions that affect how much weight a corrugated box will hold and support. The most critical is the humidity level of the storage room. In most office environments you can expect nearly full capacity. In a humid environment you can expect a 75% drop in capacity. We do not recommend stacking any box over 6 units for safety. In any case, unsupported boxes should not be stacked over five feet high. Please click on the Contact Us tab below to get information on a specific box. Please provide the item number.