I have this bag as a diaper bag, one for my gear at work, and wife has one with a first aid kit in her car:
EOD Utility Bag, Mine bag
Great company for BOBs and miscelaneous gear for them. For example, great 123 battery holders:
Compact Military Battery Holder
Lots of these items have found their way into my work gear:
Stevens Every Day Carry
I keep a Surefire light, some batteries, some trauma stuff, couple of snacks, cash, Glock spare parts "survival kit", 3 Glock 19 magazines and an MTM box of 50 rounds of 9mm ready to go. Really, just enough to get me from wherever I am to home or to work or to meet up with the wife and son. We have worked out communications, meeting places, shelter locations close and far away, etc.