All right, you win . . . that is definitely my number one annoyance (even more than ticks and skeeters). Discarded water/gatorade bottles, beer cans, snack bar wrappers. . . someone carried it in, how hard is it to carry it out?
Also flagging tape tied throughout the woods. I pull every piece I pass down, carry it out and throw it away. If you can't navigate your way 75 yds along the pines/hardwoods edge without needing to mark a trail with a 2 foot length of flagging tape on every third tree maybe you should consider a different past time.
100%! Here in TN they are too cheap to even use flagging tape so I just see old WalMart grocery bags tied up to mark trails.