These are great little bottles! I bought them to use with my Spectra S2 breastpump. They fit perfectly, and I like them better than the original bottles that came with my Spectra S2 because they are shorter and fatter, so it's easier to "balance" them when I am double pumping. I also really like that they all come with a nice quality, one-piece screw-top lid (as opposed to those silly two-piece disc and rings that come with many bottles, including the Spectra S2 original bottles).The only downside is that the measurement markings start just below the 1.5oz line, and since the shape of the bottle is a little curvy then it's hard to determine how much milk is in the bottle below that line. I often pump less than 1.5oz, but I don't need precise measurements, so I compensated by filling one of the bottles with exactly 1oz of water, then I capped it and left it on the counter for comparison whenever I pumped. After a few days I got pretty good at estimating where the 1oz line should be.I would definitely purchase these again!
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