what type of weight retention/release has this BC got? Is it mechanical retention or velcro?
Weights are integrated in the pockets on either side of the belt strap or in zippered pockets on the back. The pockets on the belt strap have a 2 part system, where you put the weight in a zippered pocket first and then put that into the pocket on the belt strap that closes/holds it in with a small flap and plastic clip. However, this picture looks like it is zippered pocket only on the belt strap--which is a little different than mine.