Corrugated box assemblies, blanks, and systems for individually shipping a bag of liquid stored therein and converting an inner portion into a bag-in-box dispenser are provided. An example box assembly includes an inner portion including a plurality of walls. The inner portion includes an interior configured to receive and store the bag of liquid, which may range from about 3 to 6 gallons. The inner portion further includes a removable perforation feature defined by a series of perforations on at least one of a front wall and a front top flap extending from the front wall. A top portion and a bottom portion each include a plurality of walls that, when formed, define an opening sized to fit around the inner portion. The box assembly may be configured to pass individual box shipping test standards, such as ISTA and SIOC test standards. Methods of forming the box assembly are also provided.