Here's how this project happened:

https://twitter.com/JeremySCook/status/730801161486262272

My guess was 'tennis ball picker-upper'. I was wrong (it's a cup holder for his bike), but it gave me the idea for this project.

Future improvements:

  1. Add a shoulder strap using eye bolts and rope
  2. Add one or two of those short pot handles to the cap