Easy to use: Only the water bottle snap diameter is 55mm and without scrown, then press hard until you hear a "POP" sound. This is the important step of non-leak. Sealing strong: Sealing inner cover + Sealing lid, can ensures sterile environment & protection against spillage. Make sure you can drink clean water Reusable: Replacement for several times, say no to lots of useless disposable water caps, economizing the resources and protecting the environment "How to use?
1, put the cap on the water bottle
2, press hard until you hear a sound ""POP"", this is the keypoint to make sure spill free.
When the first use,the top caps is a little tight,but do not influence the use of cap.