Hmm, I'm terribly horrible at explaining things.
It's basically a square bottom tote with a zipper added to the top. You attach the lining to the zipper gussets then fold under the edges of the lining and gussets and the outside fabric then sew them together as seen.
I came across a tutorial on how to do the zipper a looong time ago, but I can't remember where. Maybe it was even here?
I'll be making more soon. I can post picures of how I did it, if you're interested?