PRO Gravel Bag - Top Tube 0.7L BPW or (2) use the silicone

or (2) use the silicone sleeve and mount with zip ties

The rear derailleur and front derailleur work digital

and unique asymmetric design which allows you to pack more into a smaller volume

Flat Mount

When speed across most any terrain is priority number one

PRO Gravel Bag - Top Tube 0.7L BPW or (2) use the siliconeThe PRO Discover Top Tube Bag is a waterproof top tube bag for bikepacking. Features Top tube bag for bikepackingEasy to reach storage space700ml capacityWaterproof constructionWaterproof zipperTwo bolt or Velcro attachment optionsCable exit for charging while ridingBungee cord storage for quick access to small itemsReflective details for increased visibility Mfr Claimed Weight 107g