Hydro Flask is giving away a free 24 ounce bottle in your choice of best-selling spring hues Dew or Lupine when you spend $99. The offer is good while supplies last.

Hydro Flask is offering a 20% off discount on popular water bottles, tumblers and more — but there's a catch on what's marked down. Here's what you need to know about the big St. Patrick's Day sale.