This bag is perfect for carrying small items that you need easy access to on long trips.
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Handlebar bags can be a clever way to carry just the right amount of stuff for a short trip.
ICE pioneered the seat-mount handlebar bag, and TerraCycle took the idea and ran with it for other models.
Even with no extra equipment, sometimes a good handlebar back, like the Arkel one can mount directly onto the top of a seat bar (but, it all has to be just so...)