I use a lot of the 'mini' and 'micro' clips but second the comment -- the two smaller sizes can easily lose what's attached to them if it rotates and pushes the spring in, whatever does that will then fall right out.
This happens in purses and bags and pockets more often than when they're supporting weight, but I've lost things just when sitting down lifts the object and turns it so it opens the clip and falls off.
This isn't unique to those, it's a common failing with any non-locking 'carabiner' and regularly demonstrated in rock climbing and para- and hang-gliding classes by just slightly slacking the weight on a clip, turning whatever's attached 180 degrees, and pulling.
The mini clips are very handy, but I'm staying with the largest size for any further purchases -- until someone (hint, hint) redesigns them or offers a replacement wire spring that is a _lot_ stronger holding closed.
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The little Victorinox stainless steel pendants are out of stock at the link; but I'd say stainless is worth getting. I've used the little plated brass type commonly available too, and over time they can wear down so they don't stay closed quite as well.
And I found out that any plastic type clip will lose its plasticizer over time and get unreliable. Steel springs rust out.
Gravity always works.
a friend just gave me some S-biners, I'll have to try them!
