Repurpose/reuse tubes
Something I have done for some years is to use old tubes when worn out, too many patches/holes to make my own extra long bungees. They are great and make easy work of securing just about anything to a rack. I collect the nylon clips off of worn out broken packs, computer bags, luggage, etc. that people have thrown out and use them to make the bungees adjustable and easy to use. I cut the tube both sides of the valve and then into long strips; or, you can use the tube not cut into strips if required. You just make them the way you want or need.