Flashlights. If you don't have a good one, get one. I run a Streamlight PT-1L, have been for about a year. The best flashlight purchase I have ever made. Runs around $50 from retailers, has decent battery life, good output, and small enough to toss in a pocket and forget about. There are lots of good ones out there, but if I were to recommend one, I would suggest taking a hard look at the PT series from Streamlight. They come in four different flavors, single or double CR123 batteries, or the same with AA batteries if you don't want to have fork the cash over for CR123 batteries. You sacrifice some run time and output with the AA, but the cost of feeding it batteries is much lower.