try Dropper Post Adapter allows the  HandlebarsBackcountry Saddle Pack   to be used on mountain bike dropper seat posts. The adapter is designed to hold the pack securely, while also limiting travel to avoid damage to either the post or the bag.Stems

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).

The Backcountry Dropper Post Adapter is designed to work with mountain bike dropper posts with a 25mm or 26mm upper stanchion diameter. These sizes are typical for posts with a 30.9mm, 31.6mm or 34.9mm lower section diameter. If you have any questions over compatibility, pleaseSee More