I ended up having to modify mine. I had a metal water bottle in one and it seemed like it was in there good. Hit a bump on the road and it fell out. I was able to retrieve it and then I almost lost the other 24 oz bottle I had on the other side. I like the idea of having the 2 cup holders on the side so I ended up adding velco into the mix on the 2 bottles that I normally use. Seems like it will work pretty good to help hold them in place but It is yet to be seen. I will report back.