If we are going to be in the car for any length of time, I try to pack snacks for everyone so we're not tempted to get junk food at convenience stores. For the times that just doesn't work out, I'm thankful for Disney Garden Foodles. They make several varieties of snacks with fruits and veggies - my kids love the one with apples, grapes, and cheese cubes. I'm not sure of all the stores that carry them, but all of the Sheetz stores I have been to have had them. These are pretty filling and could easily be used as lunch on the road. If anyone knows of other places that carry them, please comment so we'll know where to look when traveling!