This cup works great for the purpose of making 2 drinks and only ...
This cup works great for the purpose of making 2 drinks and only carrying one bottle.  You have to make sure everything is securely shut before shaking or you will find yourself with a serious mess. The openings where you drink out of are a bit difficult to shut which is the only reason I gave it 4 instead of 5 stars.
Rating: 4 stars