I absolutely love these tumblers! I bought 2 sets (total of 6 tumblers) and have been bringing them to work every day for the past 6 months. They help me stay hydrated. My goal is to drink two full tumblers of water during the duration of the work day.CLEANING:They're easy to wash (dishwasher safe on the top rack). You just need to use a pipe cleaner to clean the straws.AESTHETICS: Love the clear plastic.USABILITY: These tumblers fit in my car's cup holders since they're tapered at the bottom and they hold a ridiculous amount of water. It's dual-walled, which adds an extra bit of insulation and prevents condensation from dripping anywhere. The outside of the cup is never wet, even though I fill it with ice every morning.DURABILTY WATER SEAL:It's made of a durable, clear acrylic. They have not shown much sign of wear through these past 6 months. I did crack one of my bottles by dropping it from a high place onto a stone floor. However, I would expect most plastic things to crack at that height. There is a rubber gasket inside of the lid to prevent water leakage. However, just be sure to check whether you've screwed the lid on correctly. Otherwise, it may leak when tilted. When it's on correctly, it's never leaked. The only place that isn't water-tight is the hole from where you would insert the straw. This has never been an issue for me because I don't hold my drink sideways. However, you would not be able to just throw it into a duffle bag.Sometimes I make cold-brewed iced tea by filling it with ice, water, and a tea bag at night. Then, it's iced tea by morning. I've never used it with hot liquids since it's plastic.
Rating: [5 of 5 Stars!]