I have 4 packs of blue glasses. They are amazing. I was going to leave a review just because they are so pretty but decided to test first. I filled the cup with ice, put the lid on and set it aside. After 3 hours there was still no melt. Some water leaked out after 6 hours. After 7 hours it's still mostly ice and just a few drops of water. I really don't know how much more you can expect from them. I don't know if they'll scratch or dent over time, but they're pretty cool right now. The stainless steel straws are an added bonus but I would buy them anyway. No doubt I will be buying more hostess gifts for people with boats and/or pools. Each jar is packed in a separate box and makes a great gift together or individually.
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