Is it safe to stack one bookcase on top of another?

Standard commercial bookcases are not designed to be stacked — the right move for tall storage is to order a single taller unit (5-shelf, 72" tall) rather than doubling up two shorter ones. If stacking is absolutely necessary, both units need to be mechanically linked and the combined assembly must be anchored to the wall. FindOfficeFurniture.com can advise on safe tall storage configurations — call 888-719-4960.