There’s a new celebrity-approved tumbler in town, and we’re adding it to our wish list. Kendall and Kylie Jenner have both been spotted carrying the HydroJug Traveler, a stylish, insulated tumbler that combines a leak-proof flip-straw lid with a sturdy handle and cup-holder-friendly design, making it an easy pick for everything from Pilates classes to running errands. Even better, HydroJug says its insulation keeps drinks cold for up to 24 hours, so that ice water you poured in the morning can still be refreshingly chilly hours later. Of course, the Jenner sisters aren’t the only ones giving t...