1 fat quarter per bag
Step 1: Take your fat quarter and situate it so that the long edges are horizontal. Cut off a 4" strip.
Iron your strip in half hotdog style, wrong sides together.
Open your strip up and fold down the edges to meet your creased middle.
Now fold the strip back along the first crease and iron again.
Zigzag along each of the short edges. Then topstitch around both strips. Set aside for later.
Iron open the seam you just made and center it so it is like so. Sew along one of the open edges to make the bottom of your bag.
Take one of your corners and measure from the point 1/2" to 1 1/2" (depending on the shape you want your bag to take on: 1/2" will make a narrow bag good for zuchinnis and 1 1/2" will make a wider bag good for apples) mark it, and pin it. Repeat with the other corner.
Sew from one mark to the other. Trim off the excess leaving a 1/4" seam and zigzag it.
Turn your bag right side out, you're all done. To cinch the bag, you just take the long loop and pull it through the small loop.
If you want a cleaner look, you can serge your inside seams.
You can see the difference here, left: serged, right: sewn with a regular machine.
Aren't they pretty? Now lets try to remember to take the to the grocery store with us!