I still have the original bag in the vacuum so I really can't comment on the 9-pack just yet.  I have 4 cats and they are always "playing" with things other than their toys, I.e., my jewelry, my collectibles, etc.  When I finish vacuuming, I usually empty the bag into the garbage to make sure an earring or ring wasn't sucked up.  I haven't had a problem so far so I guess they will be equally as good.