Extra Large Battery Storage Case for Milwaukee M12 M18 18V Battery and Charger, Batteries Box Holder for 12V M18 18V 2.0/3.0/4.0/6.5/5.0/8.0/6.0/9.0/12.0-Ah Batteries, Adapter (Bag Only) - Red
Amazon.com: Extra Large Battery Hard Carrying Case, For Milwaukee M18 18V/ M12 12V Battery and Charger, Batteries Box Holder for 2.0/3.0/4.0/6.5/5.0/8.0/6.0/9.0-Ah Batteries, Adapter (Bag Only) - Black : Electronics
Milwaukee deep packout - M18 battery holder | eBay
Battery Rack for the Milwaukee Packout Large Box - PowerRAX