Solid and really well built. It's my first flex straw cap, and it'd not my favorite. Just kind of annoying to disassemble and clean, so it's not worth the hassel. I think in the future I'll sick with the standard cap. Otherwise it looks great and is built like a tank.

I purchased 3 hydro flask containers this Christmas for gifts 🎁 and one of them was personalized. I have several bottles, food containers, lunch boxes, etc and I love them. They color choices are beautiful and functional.