Around Christmas I picked up one of Tec Accessories P-7 Suspension Clips for my keyring, that means I've had it for around 5 months now using it every day. The clip shows almost no wear and has stood up very well (as it should, it was pricey for a piece of folded metal)
and seems to be made out of a spring steel as it will bend but go right back to it's original shape. It is a very well designed piece of gear for it's size and use. As of right now I have 2 keys on it (house and truck) but I have had many many more (When I use one of my parents vehicles for awhile I just clip those keys on to my keys). I think I have had as many as 12 or so keys on this clip and there was no bulge where my keys were and I didn't even feel them there.
Here is how they sit inside of my pocket, they just hang out and chill until I need them. It was a little hard to get used to clipping my keys onto my pocket every time I needed them but now that I am used to it I don't even notice I do it anymore.
from here for $12.00 plus shipping, which for me ended up being about $15 total. Quite pricey but a quality product. If I were to do it again I would probably do it myself and end up with about 20 of them for a few hours work and $20 for materials but that is because I have access to the tools needed for making one. In the end I'm glad I bought this because it exceeded my expectations (which were pretty high from the reviews I had read before buying one). If you want one and you have the cash, I'd say buy the sucker. You will like it.