Things like bread and poundcake usualy get put into a basket, and I try to avoid singletrack with rockgardens on the way home. Every once in a while I am on a fun ride with a basketless bike, and I get a call to pick up some bread or something. I usualy find some cardboard, and fabricate a container that holds tortias, or bread, or once a bunch of books I found at a yardsale. Usualy I carry several straps around the seatbag so that I can lash something like that to the frame, usualy inside the diamond, sort of hanging down. Once I rode home with four ten foot lengths of 1.5" pvc pipe strapped to the top tube. Looked pretty crazy, but it worked. my jersey pockets were stuffed with fittings and a valve. My father had called and asked me to pick them up. when I pulled in on a roadbike with all that on it he did not even bat an eye.