https://bikepacking.com/gear/dropper-post-seat-bags/
Look. When you graduate from little boy gravel bike school, to proper mtb. You will know what I mean. That top one would be fine, the 2nd one OK if you keep it really light.
@hippy started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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https://bikepacking.com/gear/dropper-post-seat-bags/