I tried Power Bars, but they're pricey and a little high on calories. They're also hard to open, and in hot weather get a little sticky. Fig Newtons are an inexpensive alternative. They'll give you the carbs you need, and you can almost buy a whole box for what one Power Bar costs. I put the FN's in a sandwich bag before heading out on the road. Raisons are also excellent. I get a ten pack of raisons from Walmart (about 2 bucks). They are individually packaged in little boxes, and are handy to stick in your pouch. If I remember correctly, just one little box provides 40% of the iron you need for the day.