ビッグバイトバルブカバー

Dropped my bottle in the dirt at a job site and the bite valve stayed grit-free thanks to this little cover. Fits snug and hasn't popped off once after a few weeks of real abuse.

Dropped my bottle in mud on a camping trip and the valve stayed spotless under this cover. It snaps on tight and hasn't come loose once in months of daily use.

The cover does keep the bite valve clean when my bottle's rolling around in a work bag, so that part works. But it pops off pretty easily when I shove the bottle into a side pocket, and I've nearly lost it twice already.