It's easy enough to add a lining with pockets though. (I swear this is just regular lining fabric and doesn't burn your retinas in real life. I think it was too sunny when I took the picture.)
I just used the bag's dimensions to make a lining the same size. Then I folded down the top edge and slipped it inside. It was pinned in place just below the hem of the bag's top edge. I used an edgestitching foot to sew the lining in place. (Grey thread in my needle and white in the bobbin.)On the outside it simply looks like another row of topstitching.