Modular box assembly

A modular box assembly comprising:

• a box defining a box cavity within the box, the box further defining a top end and a bottom end, the top end defining a box opening connected to the box cavity, the box comprising:
• a first side panel extending from the top end to the bottom end, the first side panel at least partially defining the box cavity;
• a second side panel extending from the top end to the bottom end, the second side panel coupled to the first side panel, the second side panel further defining the box cavity;
• a shoulder extending inward from the second side panel and into the box cavity, the shoulder comprising a first sub-shoulder and a second sub-shoulder positioned within the box cavity, the first sub-shoulder and the second sub-shoulder attached to the second side panel, the first sub-shoulder comprising a first wing and a second wing, the second wing hingedly coupled to the second side panel and positioned in facing contact with the second side panel, the first wing hingedly coupled to the first side panel and positioned in facing contact with the second wing, the first sub-shoulder, the second sub-shoulder, and the second side panel defining a shoulder channel;
• and
• an inner box disposed in the box cavity, the inner box comprising a channel tab, the channel tab frictionally engaging the shoulder channel to secure and suspend the inner box within the box cavity between the top end and the bottom end.