Diggit, I pack out all trash. Perhaps you missed the part of my post where I don't like to come back to items, thats why I dig them out? If you have a flattened can that is say 8" down, and you determine that with a hole of only a few inches, perhaps even a screwdriver, you then have the dilemma of digging a pretty substantial hole (flattened can at 8"), or moving on. I weigh in the amount of disruption I have to do to the ground to recover something like that, knowing its junk. Many times, if there are many roots, etc, I may leave it, because I know if I dug them all, the park would be a mess, and it would impact everyone being allowed to do things like dig there.