As an avid soda drinker / carbonated beverages drinker, I am thrilled to tell you this actually works as intended! I never used to be able to carry carbonated drinks out and about unless they were in the plastic bottle they were packaged in, or the can which can't be resealed, because every time I tried to put it in any of my other tumblers or bottles that close, even my yeti cup, they would bubble and leak at the seams of the seals and lids. This ninja bottle doesnt leak at all! I am so thrilled with it, I can bring my sodas, flavored sparkling waters, and anything else whether carbonated or not, out in this bottle. Over all I highly recommend this to people who have suffered similar issues to mine.