A marble cape rack flatpack can be made at a workbench (Bench with lathe only) in the workshop of a player-owned house. Like when making the normal Marble cape rack, this requires 90 Construction, uses 1 marble block and gives 500 experience. The flatpack can then be used on a cape rack hotspot in a Costume room, either in building mode or not. This requires no Construction level and gives no experience.
The cost of making and selling a marble cape rack flatpack from scratch gives a profit of: -32,970
After completing the hard Fremennik achievements, they can also be traded to Advisor Ghrim in exchange for 32,500 coins being added to your kingdom's coffers in Miscellania. See Flatpack: Miscellania reselling for details.
See Cape rack for a list of capes that can be stored.