We got them to take our bottles to Disney World. They are convenient and pretty easy to install. If you have a larger diameter bottle it can be a bit stiff, but if you soak the plastic neck in hot water a little, the plastic will expand enough for it to work. We supplied them in 26oz and 40oz valley. Bottles from Walmart and 32oz thermos bottles. Valley bottles needed a heating trick, but thermos worked right away.
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