Comment by Fricken

I picked up a portage bag, which is a heavy duty waterproof backpack big enough to hold a dead body, but I use it mostly for groceries and other big hauls on a bike. It's basically just a big bucket you wear on your back. I suppose it's less comfortable than a trailer, but it doesn't require setup time, stores away nicely, and can hold 2 week's worth of groceries for 2.