I usually stow it on the underside of the tramo so I can get it when the boat is capsized. I don't use any blocks to hoist it to the boat. The bag weighs very little inthe water. It only has weight when you pull it out of the water. That's why when you get it to the surface you use the grab handle on the bottom of the bag so you don't lift the water.
An TheMightyHobie18 is a Magnum if it has the smaller (6' long) welded wings and the standard TheMightyHobie18 mast (not the taller 18SX mast). I will be looking for an all aluminum SX mast (did Hobie even make those in the States?) in the spring. I will have a bit of a Frankenboat with the SX mast and the Magnum wings...