Lifefactory Sippy Caps for 4-Ounce and 9-Ounce BPA-Free Glass Baby Bottles, 2-Pack, White, LF135009C6

I don't use the silicone inner, but if you leave the bottle lying on its side then it will all leak out lol. I still love the lids. They are to prevent spills.

I researched these caps for several months before actually taking a chance and getting them despite all the negative reviews. I have had no serious problems with them. I’ve had the caps for over a month now and they have been washed over a dozen times, no issues! In my experience all sippy cup lids/caps “leak”. For the most part these do not unless my child leaves a little liquid in the spout of it. I’ve had bottles laying on their sides or upside down for quite some time and no leak issues. There is a rubber type valve in the cap, some reviewers have stated that they removed it I did not. This is what helps the caps NOT leak. When you take the rubber valve out of the plastic cap the top of it has a small slit in it. While washing them before 1st use, I pinched the opening of it to kind of unstick it. When I put it back together I sucked through the cap to see if it had an easy flow & it was perfect, my toddler has no issues. It might make more sense if you purchase them. All in all, I’m super happy with my purchase.

I have been a long time Lifefactory customer for years. We use their bottles for our 2 year old and have been using their water bottles for over a decade as adults. I purchased a set of the caps in September of 2024. We keep them dry, they are washed in the dishwasher daily. We soak them in a white vinegar solution weekly. I have used tooth picks with a baby wipe to clean out the gunk but they just do not stay clean. The second picture is of the brand new ones I just purchased today.

Love that these go onto the 4 oz and 9oz bottles we have, but they seem to crack easily as we dropped the bottle from not very far up and the plastic cracked. I purchased more, hope they don’t continue to crack :/

I'm giving this product 5 stars because this is the only glass sippy top that my twins will use. I have read in the other reviews that these tend to break, and I have had some break. After a few broke, I e-mailed the company and received a response addressing my concern first thing the next morning. I learned that if you do not over tighten them, when the bottle falls or is hurled by a toddler, the cap is much less likely to break. I had previously been over tightening the lids for sure. I did take the silicone piece out because it doesn't seem worth an extra thing to clean. Perhaps this advice will not be popular, but I have found that addressing the issue of my twins not throwing the bottles is a battle worth fighting. Getting hit in the foot by a dropped bottle hurts! I will continue to buy this product to extend the life of the glass baby bottles.

4 stars only bc I’ve used this product before and like it. I ordered these to replace my super old one that cracked and got lids instead. Nervous to reorder and have the same thing happen.

These caps are good for toddlers. I love life factory bottles so they are good to use on the bottles after the nipple top phase. The only issue is that if my toddler drops the glass bottle.....the bottle itself holds up but this cap will break. Otherwise these are good.

These are terrible. Once screwed on, it is impossible for anyone, including adults, to get any liquid out. First, the silicon piece needs to be perfectly aligned, which is hard because it skids while screwing the top. But second, it cannot be screwed on completely tight, or nothing will come out. This makes it useless because our child unscrews to make a mess. Sucks because I picked the bottles for this reason. Very hard to use properly. But they do not leak, I'll give them that...