Don't know about using it as a catapult type sling due to the lack of stretch in the rubber but if you had done the necessary training ahead of time that little square of inner-tube could be combined with the paracord to make a really decent ancient bola type sling. Use the inner tube for the pouch, and the paracord or even just the strands from inside and your GTG. Of course the practice and training needed to be accurate with this type of sling is daily for a year or two - but heck it's fun to practice doing what David did to Goliath!