Copied from Amazon on the Saddlemen seat bag:
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Two mounting systems included: the "versa-mount" under-seat yoke and harness, and an adjustable sissy bar strap system that easily attaches bag to your motorcycle's seat, luggage rack or sissy bar.
Backrest pad can be adjusted for additional comfort for the passenger or driver.
Include detachable backpack straps for easy off-the-bike jaunts.
Include another large top-loading main compartment with internal organizer pocket.
Five external Pockets, two of which can be expanded for added capacity