A loft bed denotes a bunk bed that has only the top bunk, creating an open space underneath that can be occupied by a chest, drawers, or even a work area. This makes loft beds an efficient use of small spaces by utlizing the entire vertical area that would otherwise be left unused. Some loft beds even have stowable/trundle beds while retaining the capability to contain workstations and drawers. Some loft beds are more expensive than bunk beds due to built-in storage capacity and other features.