ProStack racks - Most efficient way to store or transport 5-gallon water bottles for bottled water. This modular racking system is made up of layers (similar to LEGO) with each layer holds eight 5-gallon or 19-liter bottles. It’s the ideal way to streamline your water bottle storage and transportation process, and it can lower overhead expenses. This tough, durable product is a one-piece injection-molded rack made out of high-density polyethylene, and it includes ultraviolet stabilizers. This construction adds to its stability to reduce bottle leak concerns during transport. It’s low-maintenance, and you can keep reusing the same racks for