San Luis Sourdough is filled with air pockets and holes. It's the swish cheese of bread. In fact when I got two slices to eat to refresh my memory for this review they fell apart before I got them in the toaster. Still, delivers on the sour so that's good.
San Luis Sourdough Sheepherder's Bread is not sourdough. I think the name is 'San Luis Sourdough' and the bread is just white bread without the sour. I'm not big on sour so this was fine. If you could eat boredom this would be what it would taste like.