I've been playing around with Jordy's GREAT tutorial for a square bottom bag and came up with this A-line version.
I will post a more detailed tutorial if anybody needs it, but basically it goes like this:
Make a pattern that is a triangle with its top cut off instead of a rectangle. You still cut the little squares out of the bottom, you use the same pattern for the handle. For this bag I also added a flap - just measure a rectangle that is the same size as your opening, and as long as you'd like it to be on the bag. I rounded the corners for niciness.
Now - assemble as you would for the Jordy bag. Sew the outside with interfacing, sew the lining (I sew both corners together and leave a hole in the top front to pull thru instead), sew the handle, sew the flap together right sides facing -turn inside out and iron. Turn the lining right side out. Slip the handle down into the bag, pin the flap in place on the back (INSIDE the bag, right sides facing - remember - anything you want on the outside must be on the inside). Stitch all around the top leaving a hole at the front to pull your bag thru. Turn it all right side to itself and press the seam down where the hole is. Stitch all the way around.
NOW - on this bag I haven't put the velcro under the flap yet, and I didn't stitch all the way around the top because my NON free arm machine wouldn't do it with the stiffness of the bag. Instead I jsut stitch witched the seam closed and ironed the top flat. Obviously this pattern is still in its tweaking stages. I plan to make it a little wider at top and bottom in order to accomodate my equipment (it won't even slip over the end of my ironing board and I don't have one of those sleeve thingy's either!) BUT you get the general idea.
I plan to make another one soon so maybe I'll learn more then.
Let me know if you have any questions! Enjoy!