One of the most common questions here at Hygeia is what bottles are compatible with our flanges. We have compiled a chart with our test results. We have grouped the results into brands compatible with your Hygeia flanges directly, brands that are compatible using our Hygeia Narrow Mouth Adapter ring (sold separately from some accessory sets) and brands that are not compatible, or only thread partially. If you have other combinations that work or are not listed here, please leave them in the comments and we’ll keep the chart updated. Do you want us to test a brand that you are thinking of using? We’re happy to do that, just leave us a comment.