The HydroFlask brand insulated bottle was all the rage, quite a major fad, in Hawaii at the time I left about a year ago. While there are other insulated bottles of similar design on the market, HydroFlask was the bottle for the "cool kids" (and "cool adults").
I received this 40oz HydroFlask as a parting gift from my co-workers. I had not tried it out until recently. And... while I cannot speak with any authority as to the efficacy of lesser brands and no-name insulated bottles, the HydroFlask lives up to the hype.
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