Today, December 7th only, head over to REI where they are offering up this Hydro Flask 32 oz Tumbler in Cobalt or Graphite for only $19.73 (regularly $39.95). Hydro Flask bottles keep your drinks ice cold for up to 24 hours or piping hot for up to 12 hours and they include a limited lifetime warranty. – Emily The hydro flask is sweet! Note the Hydro Flask does not qualify for the extra 25% off. We Tested 5 Water Bottles From Expensive to Affordable!