There are a few more things we need to do to get our main ingredients ready so we can bust this thing out.
One of them is the main zipper. You'll need 2 strips a bit longer tha your zipper of choice (Mine was 18") Once the zipper is in this bit will need to be the same width as the piece your using for the bottom and sides. I started with a strip of that same width and just cut it in half.
Press in 1/4 inch on each piece.
Top stitch the other side too.
Oh, tack that handle on beside the zipper too. Make sure it's centered.
Take the strip that makes up the sides and bottom and stitch that piping on. (You'll want to have snipped out the cord from both edges)
Let's pause for a minute to note that one end of the zipper has a line of top stitching below the piping,
Now we've got a situation that looks like this. Go ahead and close up that hole. Just turn those right sides together again and stitch up the gap.
Tuck all the straps inside, match up the bottom corners and start stitching around.