These were our favorite bottles!!!! My son liked the nipples for these and the dr brown nipples best. Dr brown is nice and all but are they this easy to clean?! When mombie forgets to rinse the bottle out right away there's no stinky nastiness to clean out, you just toss the plastic inside and wash the nipple! I was so obsessed with these! Great for trips too, you don't need a full on washing machine, just a little soap and water to clean the nipple off. Easy peasy!