The bottle I have fits fine in this carrier and it can be easily adjusted for different sized bottles. I have a 17 oz. bottle though, and I think a bottle any larger would not fit right because the two straps that hold it in are positioned so low that the bottle will topple out of the top if it's larger. Also, unless you are very small framed, the strap is way too short. I have it on it's longest setting and if I sling the strap around my opposite shoulder like in the picture, the bottle comes to higher than waste level and the strap is very tight and uncomfortable around my shoulder and keeps cutting into my neck. As I walk, my arm hits the bottle, so I have to position the bottle way around on my back - which looks stupid and makes it less convenient to drink from. If I sling it over one shoulder like a purse, it just keeps falling off. Honestly, would it have killed them to make a longer strap? Anyone who doesn't have a tiny frame is going to be annoyed by the lack of length on the strap.