In addition to my headlamp, I carry a Life Gear single AA flashlight. It's about 4 1/2" long and 3/4" wide and puts out a solid beam that will light up a spot 100 yards away. I love that thing. I have two of them, and am always using them around the house as well. I just wish I had bought a couple more of them for the vehicles. I can't find this model anymore. All the newer ones are bigger with a flasher on the end. I like how compact these are.
The best part was how ridiculously cheap they were, I think $30 for a two-pack. I've been using these for three years, and my 3C cell larger 400 lumen ones for probably 5-6 years, and only had one problem. The power button stuck on one of the C cell ones and I sent it back to them. Had a new one at my door within two weeks.