I am not a fan of ditching weight at depth and the above information is good. However there are valid reasons for having ditchable weight...on the surface, handing gear up to the boat crew, carrying gear. Threading hard weight on to your harness is not the answer. I use these on my rental BP/W, and have these on some of my other rigs. Both of these pockets thread securely on to the harness and have an inner weight pouch that is easy to load, remove, handle, and ditch.