The specialized 24oz big mouth 2nd generation is their best selling sports bottle and is now new and improved with a comfortable ergonomic design the bottle is easy and comfy to hold while retaining its 100 leak free seal new big mouth cap design features a wide water channel to deliver up to 50 greater flow than other leading bottles plus improved functional outside grip the large soft and reliable poppet top is easy to activate and seals tight making it 100 leak free easy to grip and