These exclusive Owala bottles always fly off the shelves, and one fan-favorite design just made its long-awaited return.

As of March 28, the Stanley IceFlow 30-ounce tumbler is down to just $28 at Amazon during its Big Spring Sale. That's 20% off its usual cost of $35 in the navy, plum, cream, and tigerlily plum shades.

Whether you're a wellness enthusiast or just curious about the science of hydrogen-infused water, this deal lets you test it ...