Kleen Kanteen is my fave brand for liquid drinks! I've got the non insulated 500ml bottle as a birthday gift years ago, changed the cap to a stainless steel one last year, and it is still going good. At the recent sales, I picked up the sippy cup, I call it the sippy cup but it is the 437ml tumbler with straw, when I heard the news that single use plastics were banned. Drinks stay cold and refreshing for the whole day. Even ice cubes don't melt as fast. Perfect for our extreme hot summers.

I would have given five stars with the exception of two small dislikes. I did not like the straw. I would rather have a longer straw with a smaller/shorter silicone end, and I would have preferred the straw to be slimmer. No matter though, as I had my own on hand and simply switched it out with that. Second dislike, the size says 20oz, but I feel as though it might be a bit misleading. If you fill the cup to the brim, you are unable to put the lid on as it will cause the cup to overflow, or gush up geyser like through the straw opening. So, without the lid, yes to 20oz. With the lid, probably 17-18oz or so. Overall, it's a great size for my morning ice coffee and keeps it cold for as long as it takes me to drink it. A quick rinse and it works as a perfect water cup to refill and keep me hydrated all day.

Having purchased the 16 ounce tumbler previously, I knew the quality of the product. I purchased the 20 ounce tumbler for my son because the 16 ounce wasn't quite large enough. Then I used it for my smoothie while running errands, in Florida, in August! Wow! Over several hours I got in and out of my car, leaving my tumbler in the car with temperatures reaching 100+ degrees. Incredibly, my smoothie was as cold and fresh as when I made it every time I got back in the car. Needless to say it's my tumbler now. I use the pint lid and a glass straw with my tumbler (love this combo) and I keep it with me at all times so I no longer use disposable plastic at restaurants or our local smoothie shop. Yay!!! #BringYourOwn.

I great sturdy tumbler that keeps my hot drinks hot and cold drinks cold. It's a great size for cold drinks or big mugs of tea, I prefer my coffee in small volumes so it's a bit over sized for double espressos! Still it very much does the job. I'd have preferred they had a lid that could be completely sealed however the lid is design is well advertised so I was happy to make the compromise. I'd buy one of their flasks if I really needed that. The only draw back is my hot drinks take too long to cool to a reasonably drinking temperature ;)