I found an excellent inexpensive screwdriver for roadside repairs and adjustments. It's a Kobalt 10-Pack from Lowe's.(There are some on Ebay, too.) It really only holds eight bits though. And of course you have a 1/4 inch nut driver for your hose clamps. You can also open topo chico water bottles with it if you take out the middle two bits. They are on clearance, but it's still a great tool. .
It's flat and easy to carry on your belt, or in a pocket, jacket, saddlebag, or toolroll.
On the left you can see the bits it comes with: PH#1, PH#2, SL-1/4, SL-3/16, T15, T20, S1, S2. I don't have any Torx or Square drive fasteners on my bike, so I swapped mine a bit. I added a PH#3, needed for at least the airbox on both my bikes. A 5mm hex, because that fits the seat of my Kawasaki. Also for the Kawasaki, I added two JIS#2 bits
, for all the rest of its screws. I kept the PH#2, PH#1, SL-1/4, and SL-3/16, as those seem to be useful. If I had a modern Harley, then I would have totally added a Torx 27, because every fastener on those seems to be that bit size.