Hummingbirds vs. robots
I bought this Coelacanth bag today at my local fabric store. It's a nice size, smaller than a shopping bag but big enough for stuff.
Coelacanth also sells this great little robot tote that would make a great lunch bag if you added a a little velcro to the top (I mean, I don't know about you, but my stuff would fall out).
I don't have a link, but it looks like this.