The back bar cooler is a staple of establishments that sell bottled or canned beverages. Their low-profile design allows them to either have a workspace on top or to slide underneath counters. Shelves are adjustable, allowing for many different sizes of cans or bottles to fit in the unit. Either glass or solid doors are available. Glass doors allow easy visibility of products to both consumers and employees. Solid doors can hide the contents of the interior if they are not neatly arranged, as well as save on energy. Pass-thru models are available that have doors on both the front and back.