It's actually made by OMS. 5 lbs each pocket, 5 pockets. 25lbs total. I borrowed one from a friend once, it was pretty comfortable (of course anything will be compared to a regular weight belt).
Diverite has these:
16 lb QB Weight Pocket | Dive Rite which I normally use on my bp/w. They're rated for 8 lbs each (16 total) but I've had 13 (hard 5 + hard 8) in each pouch for 26lbs total on numerous occasions when working at my local aquarium. I could probably have got more in there if they'd allowed soft weights. Alas, that was not meant to be. They're slightly more difficult to insert with 13 on each side but it's still doable with only minor effort. They aren't any less comfortable when overloaded. I just replaced them last year because they were getting worn and I didn't want to risk dropping a pouch.
There's also these that are rated for 16lbs each/32lbs total:
32 lb QB Weight Pockets | Dive Rite I've never used them but I bet you could get 64lbs in there if you needed to.
You can add those pockets onto pretty much any bcd if it has webbing around the waist area. If not, you'll need a belt of some kind.
Depending on your bcd, you might be able to add a "weight plate" to your bcd (various brands), or an
xs-scuba v weight pouch.