I ended up finishing them early in the morning with a baby alternately wrapped around my legs and sitting on my lap. (I timed myself as I was making them, got the last one sewn in 12 minutes!)
That's how easy they are to make. Here's a good tutorial. (It's a little fancier than mine-I don't have a pocket, and I just use webbing for the handles, or, as it was with these, whatever bits of anything that I had laying around. Some webbing, some ribbon, etc.)
They are truly lovely to shop with. So much nicer than plastic.