I originally wanted only AA because it's easier to carry 1 type of battery rather than carrying 2 different type. I decided on AA due to most devices uses AA, like AA to USB charger, AA 2-way radio, AA flashlight, etc.
Then I upgraded my headlamp from Princeton Tec EOS (2004) to EOS (2011) so I put the 2004 model in the BOB and put an extra set of battery. Now, I'm thinking of getting a small AAA shortwave radio to put in the BOB. But that mean breaking my list of AA list of stuffs and I would need 2 full set of batteries.
I could go with only AAA and have an AAA to AA converter but that's mean I need to carry a very large amount of AAA.
What battery do you guys have in your BOB and why?