Since I made my first tote bag, I've kind of been obsessed with them.
Soft and Stable is just the bomb for making bags that are sturdy but light. It's really easy to work with (none of that horrible fusing that you have to do with other interfacings) and gives a very professional result.
This is my most recent tote bag - Lyndy from Stitchbird chose all the fabrics (main exterior fabric, contrast band, and lining) and this version will be hanging out in her shop as a sample, because Stitchbird is now stocking Soft and Stable (you can find it here, here and here). It's rather exciting (and possibly dangerous) to have a local supplier.
I'm planning to make another tote bag for myself using this method, and if I'm in the right mood when I do so, I'll take photos and write up a little tutorial.