Nice and solid product. It's not a screw cap, I didn't notice the rubber o-ring in the cap. The cover is not screwed, but just snapped in. But so far we haven't had any leaks. Remember this is not a protein bottle. As for hot cold drinks. ah i don't think so. It is solid and protects your hands from hot coffee thanks to the double walls. But what about keeping things warm or cold? I say this feature is pretty much null. But still. My wife and daughter love mugs. Sloth is best manifested in bright monophonic drinks. Not a drop of regret from the buyers. It's worth the money even if it no longer keeps you cold or warm. A solid product that we would buy again. AND MADE IN THE USA
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