The purpose of the Clip-On Bag is to hold a battery-operated combo carbon monoxide/smoke detector (sold separately). Place the alarm into the bag and clip the bag to the center of the ceiling inside any of our Cabin Lodge Tents (fits all models - 10x10, 12x12, 12x16). *CLIP-ON BAGS ARE INCLUDED WITH CABIN LODGE TENT PURCHASE* - This part is only if you need a replacement or extra.