We just bought a new to us Hunter 28.5 that also came with a Carry-on Air unit. The hatch bag is missing but the unit blows great cold air (fixed a switch). I priced the hatch bag and was surprised that it sales for $150. I figured I could better spend that money on the boat and wondered if anyone ever made one out of a tarp material. Not cheap here but cannot see $150 for the bag. Ant ideas are welcome.