Get a bungie-cord net. Strap the backpack to the passenger seat.
Carry a garbage bag in the 'pack for use as a raincover.
Steelheart- '03 Speedmaster Black/Yellow
The Hayabusa Killa
16" Shorties/140 mains/Airbox drilled
Procom CDI
"There is no cure for Celibacy. But we can treat the symptoms."
| 
