*Floater*:The LP description says 5# not 4# for XS scuba pockets, and I've put up to about 6# in one without problems though it was pretty tight.
The release mechanism is to open the pocket and take out the weight. But you can also invert the pockets on your waist strap so then you just have to pull them open while vertical (head up) and weight should fall out automatically.
Thanks for catching that. I was just at LP's website to check on that and was about to correct it when I saw your post. I must say I like the XS Scuba pouch better (well constructed) than the Zeagle pouch and they're cheaper too.