Maymom Solid Lids Aka Travel Caps w/Sealing Ring Compatible with Avent Bottle; Cap Replace Avent Natural Bottle Screw Ring n Sealing Disc; Fit Avent Anti-colic Polypropylene, Glass Bottle, Avent Pink

These fit my Phillips agent natural glass bottles and spectra bottles. Have not noticed any leaks and keeps the milk fresh. Still work great after dishwasher

Fits my avent glasses bottles perfectly!

Love this thing. Great for storing milk .

I use these with my Phillips avent natural and Phillips avent anti colic bottles to carry milk back and forth from pumping at work. No spills yet.

Works great, easy to clean. Fits well and works with the Philips Advent Natural glass bottles.

4 stars because unfortunately there is still a bit of leakage when used with the Avent large-mouth bottles. The leakage can be avoided by doubling up the sealing rings, one clear one and one pink one, for the Avent bottles. The pink sealing rings work perfectly for the Spectra pump bottles. Overall a super useful product. Love having these for my Spectra pump, just didn't work as well as I would have hoped for the Avent bottles.

These work so well with my spectra pump bottles and our avent glass bottles. I wish I would’ve found these sooner!

Tightly seals bottles and easy to clean