Not strong at all. After pouring a drink into it. they become soft quickly. Try putting the lid on and half the time the mug will just fall apart or collapse from the pressure when you try to put the lid on. VERY poor quality and regret the purchase. Was really shocked by all the other reviews. But the cups definitely need to be a little stronger. Will try a different brand next time. I don't mind paying a little more to get something that really lasts. But I was fooled by all the good grades. Don't buy this.
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