I like the 30 oz size. I have other 40 oz tumblers at home and this one is a bit more convenient for on-the-go. Love the handle on the Era - definitely the most comfortable grip out of any of my tumblers with the softer silicone inside the handle. My only complaint is that it sometimes spurts water out from around the straw area after I refill the cup. I don't take the straw off the lid when refilling and don't turn it over so there's not water getting trapped somehow. I'm not sure what causes it. Mild annoyance, but otherwise a great product. If the price point was lower I'd consider buying another.
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