Nice case for sunglasses. Bought these for my family as we are vacationing in Hawaii this summer and they give a little protection to our sunglasses when we pack them on the plane. Sitting on the suitcase wouldn't protect the glasses from breaking, but I think it would work fine for tossing in our carry-on luggage. I don't think I would attach anything to them as I don't think this clip will be too long but we'll see. I'm sure my son will use the clip. I will update after our trip. Let's see if they all come home. I'm sure they're great for storing glasses in your car or purse. I don't buy expensive sunglasses, so I don't worry too much about it. My eyes require me to wear sunglasses, so I like to protect them a bit from scratches.
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