Originally Posted by jdmitch

Not folding, but they make some quick release baskets for the tops of racks. Note, I've seen some home-made folding jobs for the top.

Originally Posted by squirtdad

That is pretty big....so I will repeat my recommendation for the wald folding......you can then lay that big backpack across the rack and support the ends with the baskets. I have done this with bags of potting soil. Also that much weight you want to keep as low as you can to keep the center of gravity low.