Columbia River Knife and Tool designed the Get-A-Way Driver Multi-Tool to be part of their ID (Inspired Design) tool system, but it also stands alone as its own tool. It carries four insert bits with spring-loaded detents which keep them secured in the bit driver. It also functions as a flashlight, 10mm wrench, bottle opener, and oxygen bottle wrench.
Weighing only 1.9 oz., the tool is only 3.75″ long and 1/2″ thick. The bit driver can be placed at the end of the tool and used as a straight screwdriver or placed on the side and used as a right angle driver for when you need extra torque. The flashlight requires two R927 3V lithium batteries.
CRKT sells two models of the Get-A-Way driver. One model comes with 2 flat and 2 Phillips-tipped drivers, and the other comes with T5, T6, T8, and T10 Torx bits. They claim the tool uses standard insert bits so maybe you can carry other bits you commonly use. Pricing for either model starts at $11.