Take your oatmeal with you.
I use an electric waffle iron to make oatmeal waffles. This allows making and packing them for later use. I can reach in a bag and pull out an oatmeal waffle and have a filling meal and never stop moving. Here is a link to a recipe.

http://www.thatsmyhome.com/bakers/oatmeal-waffles.htm

There are many more just google "oatmeal waffles"