I've been a champion for the use of recycled packing materials for a while now. As long as it's clean and provide the necessary protection, I appreciate thrift and resourcefulness in packaging.
It had to happen though...I just received books in the proverbial cereal box
While undoubtedly nutritious "Go Lean CRUNCH!" provides little to no impact or crush protection.
Thankfully when I buy books I usually only want one or two of them and the rest of the lot is padding by proxy.