This bag has a 3or4:1 purchase. The blocks that come with it are a little large and heavy but worked fine. There is no righting line.The top block with the cleat has a line about 5' long. Thats thrown over the hull and tied to the dolphin striker. Kneel down on the hull hold the bag under water with the mouth open and then hoist it up until the bag is out of the water. cleat it. Put your back against it and push the bag out. I held onto the the upper part of the bag for some balance. As the boat comes over reach in for the striker and hang on so it doesn't go back over the other way. Climb up. The bag is laying right next to the boat. This bag has a web belt handle on the bottom. I just grabbed that and pulled easily on to the boat.

In fact, though I haven't tried I'm think the bag could be used to help get back on the boat easier. Sort of a step. I'll play around with it. For some people getting back on my boat is quite a chore because of the freeboard.