This is the easiest DIY ever. All you need is rope (about double the length of your waist), a carabiner and a hot glue gun (all of which I got from Bunnings Warehouse).
2. First loop the middle of the rope around one end of the carabiner, leaving the ends free.
3. Then form the same loop with the loose ends, leaving enough rope to glue the ends together.
4. Glue the ends together. I also added a knot because the belt was a tiny bit long.
Voila! You’re done.
Perfect for a spontaneous spot of rock climbing as well.