I bought them to fasten my fishing rod onto my roof bars so I don't have to break it down between fishing venues. They are perfect for the job .
These are the best I have been able to find for fitting smallish (say up to 8' by 6') tarpaulins to a run. I change them each year, necessary for at least some where they have been at near full stretch.
All good, what can you say about a bungee cord?
How did I manage without these. They hold large runs open or closed, attach runs to the cube, attach shades and 'own make' rain covers, keep nesting box barriers in place easily, and attach treats to the bars.
I bought some of these in case I lost some, and for a specialised shade I made myself, and they also work to attach the 'end of run' poles to the side of the Eglu Cube.