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Black Diamond and other Auqualung models have non-releasable weight pockets on the back of the BC near the tank band.
Aqualung "strongly" recommends using block weights versus soft shot weights in the non-releaseable pockets.
Question: Curious..........Why would it matter?
Depending on how the weight pockets are designed, it might be possible for smaller "soft" weights (containing lead shot) to slip right out of a "secured" pocket.
On the Aqualung BCDs, the trim weight pockets are usually closed by a plastic fastex clip. I have known of a couple of divers who had small "soft" weights slip out the side or through a hole in the bottom. This can happen with 1 or 2 lb. soft weights. I've found that 3 lb. soft weights will stay in just fine. YMMV. Using larger hard weights virtually eliminates this possibility.
I wouldn't use long, cylindrical "bullet" weights in the trim pockets for the same reason. They could slip out.