Not sure what it is, but we foam at the mouth every time we open Foam Magazine. They always have awesome content and great products...so when we found out that ALEX Bottle was going to be featured, we drank a lot of water to prevent excessive mouth foam. While the water kept us hydrated, we still got foamy. A nice little mention; ALEX Bottle Co-Founder Gretchen Bleiler's signature Holga Camera was also featured. Such a cool camera. We actually had someone reach out to us about using ALEX as a film developing canister...hmmmm. Another ALEX Bottle use case?