I bought 5 or 6 of these for both the 17 oz and 25 oz bottles. These are sports caps, right? Which by definition should be able yo take a tumble or fall, yeah? Well let me tell you, they don't work that way. I think all but one has broken when setting it down wrong hitting it on the side or falling off the counter. How bout just toppling over in your bag? Yep making a real mess. The center stopper piece came out every single time. I'm just so glad that God loves me and spared my electronics in there on this last fiasco. I wish I could post a picture of the mess.