My take on the metal hook things.......
Personaly, I have been costuming with my Fett suit for over three years now and I hate the metal hook things as I have had them on my first pack and they have failed on me, NEVER AGAIN!
I don't trust them to fold as I have had one come undone when the pack lifted up when I sat down and I never knew it until I went to stand up and 13lbs of pack went winging off to one side. Thank god my spotter was right there saw it and she caught my pack before it hit a wall.
That is why I went to the plastic click clips, they are sturdyier than you think and it takes alot more to unhook them if not impossible then those metal clips. It takes alot to unhook them and even more to hook them.
I have never had a problem again.
If you are worried about someone unhooking your pack, that is why you have spotters to watch you and protect your back on the side lines. They are there to prevent things like this.
For someone to unhook your pack with the metal hook clips all it takes is a quick up and in motion and it is off quicker then anyone can ever unhook the plastic clips.
My .02....
