But you can flip the cap so that it stays open and in a single place when attached. There is often a small bump at the bottom of the cap that makes this easier.

But you can flip the cap so that it stays open and in a single place when attached. There is often a small bump at the bottom of the cap that makes this easier. I also drink straight from the bottle and I find this unobtrusive. Even helpful - I no longer misplace a cap; I guess that was the goal.