I really love a bottle with a built-in straw. And even better when it has a rubber spout that flips out/seals and locks. It's easy to take the lid on and off to refill it. The downside of the plastic is that it sweats, much more than my aluminum bottles, and it doesn't stay cold nearly as long. Ice melts pretty quick. But it's still a great bottle and I use it all the time. Love the ergonomic shape it has and I don't need to refill it constantly since it holds 24 ounces.