Having a reusable lunch bag is a wonderful, simple thing, too. Mine is already four years old -- from my Master Composter/Recycler course (my undying thanks to those who offered the course, which was wonderful, by the way). Unfortunately, the logo is wearing off from so much use.
Packing a trashless lunch is a simple thing, and if everyone takes similar small steps to reduce waste, it will make a big difference in the long run.
P.S. Looking for more Simple Suggestions? Try here.