Review on MantaRing Cable Strong Flexible Waterproof by Roy Bush

These are excellent products, packed with five rings per box, very economical. I use them as rings for luggage tags, not keys. They've survived multiple airline baggage handling systems so far! The only minor downside is that they don't stay fully tightened and require periodic tightening. Because the thread is long, I think there's little chance of it breaking during each flight, but I tighten it after each flight.