When I started backpacking in 1976, I really bought into the "leave nothing but footprints" approach because it seemed necessary to preserve our wilderness areas. In all these years, I have packed out my trash. I even saved up my nickels and bought a Svea 123 stove--I've never even lighted a fire. I have the great fortune of living near the AT in East TN, so I get to hike the trail often. I have taken to carrying a bag to collect trash left on the trail--cans, bottles, wrappers. Today I hiked in to Moreland Gap shelter from Dennis Cove. I found 4 empty propane canisters. It bothers me to think that folks that are serious hikers on the AT feel free to leave garbage in the shelter, finding it so inconvenient to pack out the empty canister--but willing to leave it for a volunteer to pack it out. How could we instill the "pack it out" ethos?