My favorite hunting spot is about 2 km inshore swim (no boats allowed) with very strong currents. Heading back to shore with the extra weight of my catch and after 4 hours of swimming leaves me always on my last breath and sometimes I even feel like there is no way I am going to make it back to shore. I was thinking that if I could dump my weight belt before heading back will make my return much easier.
Can anyone suggest an economical way to make my own disposable weights (other than filling my wetsuite with rocks

)
Thanks