Dwmckee, I used a kitty litter box on my 5 day tour , worked great. They are a little taller than those orange boxes, so no heel strike issues. Great to have a waterproof container on the trip. Made 2 hooks to hold onto the rack, strap around the side and one on the top. I used it on my left rear, so no der, issues. Small nit to pick, it was kind of tall, so had to be aware of dismounting bike to not kick it.
Recomendo, $ 0.00 dollars.