Stanley IceFlow Stainless Steel Tumbler - Vacuum Insulated Water Bottle for Home, Office or Car Reusable Cup with Straw Leak Resistant Flip Cold for 12 Hours or Iced for 2 Days, Navy, 30oz

**** The Stanley tumblers have made a significant impression among parents and active individuals alike due to their functionality and stylish designs. Reviewers often highlight the eye-catching colors and ergonomic features, making them attractive options for both kids and adults. The variety of sizes, including 20oz and 30oz options, ensures that users can choose what best suits their hydration needs without Constant refilling. The standout quality of these tumblers is their exceptional insulation. Users report that these tumblers keep beverages ice-cold for extended periods, even in hot conditions. Many have noted that ice can last for up to two days without melting, which illustrates the effectiveness of the double-wall vacuum insulation. The built-in flip straw and leak-resistant lids further enhance the convenience factor, making these tumblers ideal for those on the go. Parents appreciate their ease of cleaning and the durability of the stainless steel Construction, which can withstand the rough and tumble of daily use by kids and adventurous adults alike. However, while the tumblers boast many strengths, there are minor caveats worth noting. Some users mentioned the lack of complete leak-proofing when the tumbler is tipped over, although this was not marketed as a primary feature. Despite this, the overall reception of the Stanley tumblers is overwhelmingly positive, with recommendations emphasizing their reliability for keeping drinks cold and ensuring a mess-free experience. **