A large teak bed 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 Large teak bed, this requires 45 Construction, uses 5 Teak planks, 2 bolts of cloth, and gives 480 experience. The flatpack can then be used on a bed 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 large teak bed flatpack from scratch gives a profit of: -5,880
After completing the hard Fremennik Tasks, They can also be traded to Advisor Ghrim in exchange for 428 coins being added to your kingdom's coffers in Miscellania. See Flatpack: Miscellania reselling for details.