The metal to metal in the pocket is a problem if the boltsnap fails closed. If it's a big item, trying to go past it with your knife to cut the D-ring, make a hole in the suit blah blah blah.
Bungee works best, and is very strong. The way bungee fails is usually that first the rubber inside fails, and much later does the outside nylon fail, so you have lots of warning.
S., I know you were kidding about your metal to metal comment. There are lots of metal to metal connections on a rig, sometimes it's a problem, sometimes it's not.
Basically, anytime you are connecting something that you want to be able to remove, and a bolt snap is involved, you need to have one of the attachment points be of a kind that can be cut or broken. Now this is a mouthful, so the shorthand is "no metal to metal".
As usual, use the big computer to figure out when it's a problem and when it isn't.
Before someone jumps on me and says that the reel is a metal to metal connection, yes it is. However, the reel is usually used immediately or not used at all, so not as much of an issue. Also, some of us use this method:
http://homepage.mac.com/samilaine/PhotoAlbum20.html