Two thoughts.
First, you do see most of the
Life Sling bags on the outside. My belief is that it is just more convenient than having the bag inside the cockpit. On many boats there is just no place to mount it inside the rail that makes sense. That being said, and mine hanging outside the stern rail on the starboard side, they can be a problem. A charterer last year decided to come in a little too close to a post, and ripped the tabs on the
life sling bag right off. I have never had the problem myself, but it can happen. My home slip is port tie so never a problem there.
Second,
Life Sling does offer the hoisting tackle seperately, but I went a different way. Bought a rope vang with 6:1 purchase and also use it as a preventer. In that way I actually use the equipment and know where it is. In most cases the bag with the hoisting tackle is buried so deep in a lazerette that the MOB will drown or freeze to death before you can find it.