One of the reasons this baby makes other drinking containers hang their heads in shame is because of the "powder coating," a finish that's smooth but also makes it easier to grip and totally protects against condensation. I recently bought one in a the standard mouth size and I'm low-key obsessed with it. The shape is really simple, without a lot of nooks and crannies, so when you wash it it feels easier to get all the soap out without leaving an aftertaste. The carry loop on the top is so convenient, and it's just so dang sleek! It has never once leaked in the month I've had it, even though I usually have that problem with water bottles. It's amazing!
(Psst...I also couldn't live without decorating mine with stickers, and Redbubble has really durable ones. Get the bunny in a flower crown one here and the Cheddar the corgi from Brooklyn Nine-Nine one here.)
Promising review (for the wide mouth version): "UNFREAKINGBELIEVABLE!!! This thing is THE BOMB!!! AWESOME!!! I got this from my son as a Christmas present. He ordered this insulated flask for me knowing it would not only keep water cool, but that it would also keep coffee or tea warm. It's not like I was unfamiliar with thermal liquid containers, but none of them have been any different than those that came before. So I was like, 'Okay, that's nice, it keeps stuff warm or cold, yeah yeah yeah, thank you, sweetie.' Well...obviously I had no idea. When I realized that my morning coffee was still burn-my-lips hot by 4 p.m., we decided to test it. We poured hot tea in to the thermos one morning, then screwed on the lid. We opened it and stuck in our fingers each evening and morning to test the temperature. The result? Three days. It kept tea hot for THREE FREAKING DAYS. This thing is unbelievable and I love it!!! You deserve this. Get one!" —Love Albrecht Howard
Get the standard mouth version (on the left) for $24+ (available in four sizes and in 22 colors) or the wide mouth version (on the right) for $29.95+ (available in four sizes and in 21 colors), both from Amazon.