I have six of these. These clips have now become part of my indispensable set of gadget when I travel or doing house work.
The swivel "hook" is genius, crafted from a single piece aluminum. The designer must have painstakingly modeled the clip, since it is very clear that the center hinge would mechanically finds its center in all occasion. This kind of detail always fascinates me as someone who designs and enjoys thinking about usability.
The clips are also beautifully finished. I'd wager that putting it next to any Apple product (or in an Apple Store), it would be totally at home. It's that nice. Not that it is recommended by the manufacturer, but when the clips are in the closed position, I could place well over 100 lb on it.
On usage, my wife uses it to hold up her (expensive) bags away from the floors at restaurants and restrooms. It goes over doors very easily, so you don't have to rely on any built-in (or broken!) hooks at the airports or other public places. I use it to hold luggage together, and even holding up things in flight, like holding up a Hydroflask on a recent flight.
I have also used it to hold up wires and tool buckets while doing DIY jobs around the house. The usages is really up to your imagination.
For the money, it's a deal just for the design alone. The moment you start thinking about usage, the value of these clips justify itself in seconds. Highly recommended.