Refrigerator appliance and containment system for contents of refrigerator appliance

A refrigerator appliance comprising:

• walls defining an internal storage chamber;
• a door rotatably secured to the walls, having a liner that is configured to face the internal storage chamber when the door is in a closed position, wherein (i) the liner defines a storage bin, (ii) has a back surface, and (iii) has a side surface that is substantially perpendicular to the back surface;
• and
• a support arm secured to the side surface in cantilevered manner at a position above the storage bin, wherein the support arm (i) has an internal surface, (ii) is configured to transition between a retracted position where the support arm is adjacent to the back surface and the internal surface faces away from the back surface and an advanced position where the support arm is spaced apart from the back surface and the internal surface faces toward the back surface, and (iii) in the advanced position the support arm is configured to engage a food container that is disposed in the storage bin such that the food container is disposed between the support arm and the back surface of the liner in order to maintain the position of and prevent the food container from falling over.