On hikes I carry a small fixing kit, too.
Mine consists of an old camera film canister wrapped with tape, inside a small sewing kit from a hotel, half a meter .7mm wire, 2 small zipties and as much 2mm cord as fits into the canister.
Lately I added a small box of seamgrip repair kit for fixing bags and tents (cant glue those siliconized nylon...)
Was quite happy with that.
Can fix everything from broken shoelace, backpack straps, tents, matrasses, bike tyres....