I bought this brush for this 18 oz. bottle. I have other bottles a little smaller that are not see through so I thought this photo would be better to show the size of brush in relation. After reading a lot of reviews about this and other brushes, I chose this one for its sturdiness since I did not want bristles that would damage. This is a great brush and it does its job well, I only wish I had purchased the longer one so that I would have a better reach range. While this one does reach the bottom of the bottle, I think the longer one would make the job a little easier. I was just wary of the long handle, but given this one was on the shorter side, I think the longer brush would have been fine. I hope this helps you.
