I bought the floral fabric at Fabric Depot a few weeks ago and I think the bolt listed Yuwa as the manufacturer, but doesn't have any info on the selvedge and I can't find this print online. Anyway, it's very pretty.
I tend to use a Log Cabin patchwork layout, but sometimes break up some of the "logs" by piecing together smaller pieces, and I don't always adhere to a strict layout. If you have experience sewing a Log Cabin block, you can see in the photo below where I have varied from how it usually goes together.
After I've sewn the patchwork piece, but before cutting it down to size, there is something that needs to be done: basting the edges.
So I trace out the outline of the bag body and then stitch 1/8" inside the outline all the way around the edges. This keeps the seams from starting to split open after it's cut or while it's being sewn.
Most of the time they don't split, but when they do it's kind of a pain, and they might need to be resewn. I just avoid any possibility of splitting by basting the edges.