Just how much are you willing to spend on a flashy mug? For some Starbucks fans, the answer is hundreds, if not thousands.

This Memorial Day, shop Owala's sale on tumblers. Save 30% on 24 and 40 ounce models — no discount code needed.

We used water bottles from Owala, Yeti, HydroFlask, and others every day and sent them to the lab for precision testing.