A mahogany dresser flatpack can be made at a workbench (Bench with vice or better) in the workshop of a player-owned house. Like when making the normal Mahogany dresser, this requires 64 Construction, uses 2 mahogany planks, 1 molten glass, and gives 281 experience. The flatpack can then be used on a dresser 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 mahogany dresser flatpack from scratch gives a profit of: -2,646
After completing the hard Fremennik achievements, they can also be traded to Advisor Ghrim in exchange for 338 coins being added to your kingdom's coffers in Miscellania. See Flatpack: Miscellania reselling for details.