From the publisher's 2020 Kickstarter Page:
As requested and designed in collaboration with the community, this box includes 5 plastic game trays, 6 card dividers and enough space to hold the complete Dungeon Superstructure and up to 3 of our cubical game boxes!
Back of the Box:
"This storage solution is precision designed to store the Dungeon Drop game box (which is intended to hold all available game cards and rules, organized using 7 included card dividers), 2 neoprene Dungeon Mats, a full set of Dungeon Walls, and the 5 included plastic game trays. If you don't own the Dungeon Mats or Dungeon Walls products, you can hold up to 6 cubical game boxes and still include 2 of the game trays. Whatever your preferred configuration may be, all contents will fit perfectly snug!
Contents:
-Treasure Trunk box with built in divider
-7 card dividers
-5 plastic game trays with 2 compartments each
This is not a standalone game."