The 30 oz is quite large - the cup works exactly as expected. This thing definitely holds ice like a champ. Why pay double for a YETI when this is exactly the same and works exactly the same. Been using these mugs all summer and ice stays for a long time. Even if I leave them out on the counter overnight, there is still ice in them in the morning. It meets all my expectations. I can make a iced drink at around 9pm leave it all night and day, get home at 8 pm and it stills has ice.
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