The Monty roll-top messenger bag is designed for commuters. Dubbed a “small utility bag,” it features a rolltop cargo compartment, quick-access outboard pockets and two internal zippered pockets.
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I have to say, for a small utility bag, that looks FREAKIN' HUGE to me.
Some nice features though - if carrying your stuff on you is your thing (I don't on long rides, but quite often do on errands) this could be right up your street.