Title: A major design flaw!
Product review: I own a lot of nissan thermos products, which I absolutely love, but this product has a major ANNOYING design flaw. There's an O-ring on the product that falls off when you wash or rinse off the lid. In fact it's the fourth use of the product, and I could not figure out why it kept leaking. The first leak was when the item was filled with water, so it dried; this time the leak is with coffee, so I have stains all over paperwork, which is annoying. Sure enough the item is missing the silicone O-ring. So, while this item does keep things hot or cold, there are other products with better designs.I bought two, and I intend on returning both.
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