When diving with pockets an easy way to remember what stuff is where is use a simple rule. Left = working, right = emergency. So left would have everything you would normally need on a dive (spool(s), small smb, goPro camera, and wetnotes. Everything is attached to the bungee loops with bolt snaps. Right would be spare mask, backup large smb spool. reel if needed gets clipped off to the butt d-ring, Large SMB goes in the back plate pocket. Backup lights get clipped to the chest D-rings and secured with inner tube. knife on the belt and I'm not sure what else you would need. I'm not a fan of the BC attached pockets since that real-estate is normally taken up with the weight pockets (if single tank and needed) and they sit too high for me. YMMV.... Enjoy