I used this kit without the draining bag and also with the draining bag and my strong advice is to go for the one with the draining bag. The non-draining one gets too heavy with filthy water and then pulls away from the aircon unit leading to spillage and dirty water going on the walls.
With the draining bag I used a pressure washer with the spray set on the softest setting and the amount of dirt and skim that came out of the aircon was frightening.
