1. Road atlas. Sure, your phone or car's GPS system is fantastic and works almost all the time, but I've learned the hard way that it's worth it to have a paper backup on hand, just in case.
2. First-Aid kit. Throw this under the front seat for easy access. Most of us travel with an emergency kit for the car (Fix-A-Flat, blankets, flashlights, etc), but we don't have the odds and ends in the car for those minor human injuries.
3. Healthy snacks (and local junk food). OK, so this isn't a photo of amazingly healthy snacks you should pack with you, but it was fun junk food I picked up during a recent road trip through Panama. I usually pack an assortment of hummus, sliced and washed veggies, and if I'm ambitious, a sandwich or two. This means I can curb the fast food urge and not feel so guilty about stocking up on unusual local snacks from the gas station. What are your must-haves for a summer road trip? (Images: Smith Schwartz)