This is a prototype for a bottle holder which is attached to the top tube of a racing bike.
It can be easily attached by cable ties and some double adhesive tape which is often used in the bathroom for gluing mirrors to the wall.
The bottle can be strapped down with velcro strap.
This is super useful for extra long rides to carry another water bottle.
The center of gravity is close to the main mass of the bike which I more prefer than the bottle holders attached to the back of the seat post.
The author marked this model as their own original creation.