Apidura Backcountry Dropper Post Adapter

The saddle bag dropper post adapter comes with a choice of shims for mountain bike dropper posts with 30.9mm, 31.6mm and 34.9mm lower diameters and is easily fitted using a 3mm hex wrench.
The broad, flat rear section and ridged strap retainer improve stability over rough terrain and the dropper post saddle bag adapter is compatible with any bag that uses a 25mm seat post strap (or smaller).