Do not use alcohol! That can ruin the dye on the bag. Ink is very difficult to remove from a bag, especially if it's had a chance to settle in. I read that one of the members was able to remove pen with Apple Garde cleaner, but I haven't had any luck with it.
I actually sent my Blake to Lovinmybags for different reasons, one of them being a ink mark on parts of the leather. I just got word that it was finished and being shipped out to me(great b-day present to me!) So I will let you know how it turned out. That may be an option for you
Hairspray will remove ink. But be very careful and go slowly. Spray a white rag til it is wet and gently wipe at the spot. I did this to a Cole Haan in yellow leather, ink marks were safely removed! GL!!
Oooh Jap4Life - I can't wait to find out how it turned out!!!!! And krasata20 - I'd wait to hear Jap4Life's results before sending it. I would definitely avoid trying anything iffy like rubbing alcohol.