We hate to be the one to break it to you, but there’s no such thing as magical litter-picking trail pixies. That gel wrapper you just dropped on the ground? That’s not going to decompose for oh, say 500 years! You managed to carry it out here, so surely the weight of a now-empty plastic wrapper isn’t going to massively drain your energy if you carry it back to the trailhead and put it in a bin.
The same thing applies to water bottles, punctured inner tubes, broken helmets and abandoned dreams.