A teak wardrobe flatpack can be made at a workbench (Steel framed bench or better) in the workshop of a player-owned house. Like when making the normal Teak wardrobe, this requires 63 Construction, uses 3 Teak planks, and gives 270 experience. The flatpack can then be used on a wardrobe hotspot in a Bedroom, either in building mode or not. This requires no Construction level and gives no experience.
The cost of making and selling a teak wardrobe flatpack from scratch gives a profit of: -2,242
After completing the hard Fremennik Tasks, they can also be traded to Advisor Ghrim in exchange for 169 coins being added to your kingdom's coffers in Miscellania. See Flatpack: Miscellania reselling for details.