Better yet, her pick is an affordable Amazon find that shoppers say keeps their drinks “cold all day.” Roberts was spotted strolling through New York City carrying the Stanley IceFlow 2.0 Flip Straw Tumbler in the cheerful Blue Sky colorway. Get the Stanley IceFlow 2.0 Flip Straw Tumbler for $30 at Amazon! You can also choose from 13-, 20-, 30-, 40- and 64-ounce sizes depending on how much hydration you need. Get the Stanley IceFlow 2.0 Flip Straw Tumbler for $30 at Amazon!