Needles and thread—very useful and very light. Though this is something worth having on you anyway
Lighters are vulnerable to getting wet—an alternative are non safety matches with the heads covered in wax. Either way, a waterproof container, like the ones that used to be used for camera films, is a good idea
A small compass—less useful if you have a good, local map and can tell where you are, but otherwise worth while
If you’re liable to go into more wild areas, i.e. not only urban settings, and have extra capacity, then a hatchet is very useful
an aluminum cup/can—this allows you to cook stuff, or to collect liquids other than water (which you have your bottle for)
Very nice. A couple of things that I’d add:
Needles and thread—very useful and very light. Though this is something worth having on you anyway
Lighters are vulnerable to getting wet—an alternative are non safety matches with the heads covered in wax. Either way, a waterproof container, like the ones that used to be used for camera films, is a good idea
A small compass—less useful if you have a good, local map and can tell where you are, but otherwise worth while
If you’re liable to go into more wild areas, i.e. not only urban settings, and have extra capacity, then a hatchet is very useful
an aluminum cup/can—this allows you to cook stuff, or to collect liquids other than water (which you have your bottle for)