backpack house

Opening the main pocket reveals an extradimensional space and a ladder leading down to it. Upon reaching floor, space is 4 m tal, 30 m by 30 m. it is usually found with 3d100 days rations in it and d100 copper coins, along with d20 gold coins. It has 12 cots, and several ventilators that lead to ventilation shafts in Sigil. Its warm fireplace is found with d100 logs, each one lasting one hour. The chimney goes up to a chimney on the top of Sigil.

If put in an extradimensional space such as a bag of holding or hewards haversack, refer to what would happen if they were put in it.  If a portable hole is put in the backpack house, nothing happens. However, only one portable hole can be put in a single backpack house.