From Contigo
Patented Autoseal lid automatically seals between sips to eliminate spills and leaks. For an easy, one-handed drinking experience - there is no lid to remove or spout to open, so it is suitable for on-the-go drinking whether commuting, hiking or just dealing with a busy day. No lid to unscrew or remove- just make sure to snap it closed after you’re done sipping to seal the leak-proof lid, so you never have to worry about spilling another drop.