Bicycle 2 bottle holder handlebars.

Bicycle 2 bottle holder handlebars.

https://www.youtube.com/watch?v=7mg0TbWZKQA

2 bottles.
The attachment clicks on to the handlebars.
The bottles clicks into the handlebars attachment.

6 gram.

This fits this.
Bicycle Seat bottle holder.
https://www.thingiverse.com/thing:4944784

This fits this.
https://www.thingiverse.com/thing:4945211