Dr Brown's Glass Bottles

The ceilings are expected to adapt Travel 4oz/8oz but glass bottles are 3.5 and 7.5. Anyone have this effect and plugs travel?

yes the thread is exactly the same and the same size neck

I use dr. Browns Glass Bottles 3.5 oz, the hats they travel too. all the bottles seem to be interchangeable. I just realized today that Dr. Brown nipple and ventilation Fit System in my Medela plastic bottles. It is pretty neato.