Picked up the strap-on 600 ml bottle set up and mounted on my top tube. Strap on feature works great and holds the mount securely. I did have to occasionally rotate just a bit to keep the bottle straight. Functionally not a problem but my OCD kicks in when it isn't aligned with the top tube. I was proceeding down a mildly technical singletrack section and looked down and noticed the bottle was gone. I backtracked several miles to find the bottle but alas, it was nowhere to be seen. There is a lot of dense underbrush in the area so not surprised I couldn't find it. Just previous to this I had stopped to take a break and take an drink and replaced the bottle on the mount. I went ahead and ordered another bottle today and will give the system one more chance, as it could have been user error on my part replacing the bottle. If this one gets lost or dropped, I will just chalk it up as a failed experiment.