On rides less than 50 miles, I generally only eat a Balance Bar (half way) and use GU or Beans.

On rides greater than 50 miles, I carry fig newtons (full strength - need all the sugar they can offer), or a half pj sandwich (no jelly), maybe another Balance Bar. Generally I stop and have lunch somewhere if I'm out for over 4 hours. Don't like to carry too much but then again I live in an urban area. There's a convenience store every other block!

I wouldn't get in the habit of carrying too much food and/or eating too much. You should be fueling (lightly) every 20 miles and if into a long ride, maybe every 15 - 20 minutes (after 25 miles). GU, Hammer Gel, etc is great for that.