Today only, grab a 32 oz Hydro Flask Travel Tumbler for just $20.97. The 40 oz is also an amazing deal at only $23.97. This deal applies to all available colors! THE BEST TUMBLER: The insulated Hydro Flask 32 oz Travel Tumbler is here to hydrate more and refill less. The insulation keeps drinks cold and the durable handle takes it to the next level.