I used to dive an At-Pac and would kit up in the water when boat diving. It's weight integrated. I used to laugh my *** off when people would pitch their kit without filling it first. The facial expressions and body language is priceless as they see their $1000 sinking. Having seen this happen enough, I was able to jump in fast enough to grab mine before it got too deep when my turn arrived. It doesn't count if no one sees it.