I loved the idea of these, finally an easy leakproof top for my son to use daily that doesn't require constantly taking the top on and off the bottle. I bought 2 so I could rotate bottles easily. Love that in the closed position these don't leak if the bottle is on its side, love the handle so he can carry it with ease. Don't love that they leak between the top and bottom pieces when you twist the top open. 1 lid leaked right out of the package, didn't matter what I did reassembling it, fiddling with the gasket inside. Liquid would run down your face from between the two pieces while drinking. So into the pile as a last resort back up it went. We'd been using the 2nd top and had success, but it now leaks in the exact same place, water runs out between the top and bottom where it twists. So he's back to just taking the whole top off and hoping for the best. Disappointed the product doesn't have a longer shelf life.

First, this company has great customer service since you can speak with a LIVE PERSON. The first top I ordered did not function correctly, but the company quickly sent out a replacement top. I still refer to the very clear instructions sent from Customer Service for putting it back together after cleaning (thank you), and I like the fact that you can take the top and thoroughly clean it. Top is perfect for hot beverages as the opening is not big and wide, and you can completely close that opening to avoid spillage. I also like the carrying strap. All around a great product.

I was very pleased with customer service, as they have always been quick to replace lost or broken parts. In this case a recently broken old style cap broke, and a new model was sent free of charge, 5 star service, thank you.
However the new wide mouth flex sip design caused hot liquid to come in contact with my upper lip sufficient to cause a burn!!! The new design is way too complicated as well. It has 4 parts, a top, a silicone gasket, a bottom and an inside part that fastens to the top part. What a pain to disassemble to wash, let set out to dry reassemble an hour or so later and put away for the next day!!!! Why a company that makes a terrific coffee mug gave up on a wonderfully simple 2 part top that snap hinged closed was way easier to wash, with no disassembly, and never burned my upper lip, is unbelievable! 0 stars for the engineering of the new wide mouth lid!

Hydro Flask - with a monolithic stainless steel design, the light green matte paint is extremely cute, youthful and dynamic. The advantage of the bottle is that it retains heat for a long time because of the 2-layer vacuum design, so the ambient temperature does not affect the quality of the drink inside the bottle. The lower body of the bottle is designed with an extra layer of silicone surrounding it for easy handling to prevent it from falling; very suitable for kids. In addition, the bottle is also designed with a straw for convenient drinking of children without having to open the lid. The lid closes tightly to prevent water leakage when placed horizontally or fallen. Cleaning the water bottle after use is also very easy. It's very convenient so my son and I love it!