I've not given any thought to how eco-friendly my BOB is and that would be far down my list of priorities in assembling a BOB.

If I'm living out of a backpack at some point then my carbon footprint and other environmental impact will have been greatly reduced no matter what's in it or what it's made of.

DC imposed a grocery bag tax this year so now that I'm lugging my own bags to the store I'm feeling environmentally virtuous enough for the moment.