To prepare for our first ride across PA, the man wanted something smaller than a tank bag, but not a tank bag. He found this on Revzilla.com (there's always SO much stuff on that website :P) by Giant Loop, the Zigzag handlebar bag. I love their description at the bottom:
FITS THESE MOTORCYCLE MAKES & MODELS
• BMW, KTM, Honda, Suzuki, Yamaha, Kawasaki, Ducati, Husqvarna, Triumph
• JUST ABOUT ANY MOTORBIKE
Indeed, it fit his S3 perfectly. It doesn't take up much space, you can barely see it here on his bike (right):
