I use these if not a rucksack, or empty rucksack and leg on to carriers to be picked up later. Been using these for years, easy made up out of seatbelt or nylon webbing and a couple of strong rings. Fold up small ,so can put a few in your pocket or battery bag ect.
And the leg goes through same as tommo,s and as TJones suggested mite try with knot at other end. Atb