Hydro Flask's standard mouth sports caps were designed with the adventure seeker in mind, whether you’re traversing a crevasse, or forging white water, the standard mouth sports cap is up for the task. The convenient attachment loop makes it easy to clip your Hydro Flask to just about anything. This sports cap fits the 12oz and 21oz standard mouth bottle.
Not leak proof.
Sports Caps are made from polypropylene, which means they are BPA-Free.