Here are the directions for walker bags that I made for a charity. They are easy and turn out well.
DIRECTIONS TO MAKE A WALKER BAG
Supplies: 2 pieces of fabric 14-16 inches wide by 43 inches long.
2 3-inch pieces of Velcro of both the hook side and the loop side. (The two sides are different, just be sure you have one of each kind.)
Scissors, pins and a sewing machine.
1. Cut two pieces of fabric 14-16 inches wide by 43 inches long.
2. Place the two pieces of fabric right sides together and sew all around, leaving an opening to turn the fabric right sides out.
3. Turn fabric right sides out, turning under the fabric that has been left open for turning. Press both sides of fabric. Topstich all around the rectangle, enclosing the part that had been left open for turning.
4. You are now ready to put on the Velcro: Fold the fabric rectangle in half lengthwise and mark where a center line would be. If the bag is being made of two different fabrics, decide which fabric you want the pockets to be. On the same side of fabric as you want the pockets to be is where the Velcro will be placed.
5. Measure down 5 inches from the center line and over 1 ½ inch from the edge on both sides of center. This is where you will place the Velcro, with it going down, away from the center. (I place a small dot of super glue on the back of the Velcro to hold it in place until I can stitch it down.) On one side of center you will have the hook side of the Velcro and on the other side you will have the loop side of the Velcro.) Stitch or zigzag around the Velcro, keeping it securely in place.
6. Turn rectangle over so that the side that does not have the Velcro is facing up. Fold up the bottom of the rectangle to form the pockets. Fold it up about 8 inches, or to cover where the backside of the stitching where the Velcro was sewn. Pin in place. Sew around the fabric that is folded up, forming the pocket. Mark the vertical center and sew a line there, dividing the pocket into pockets. Do this for the other end of the rectangle, thus forming a pocket at each end. When placed on the walker, there will be pockets on both the outside and inside.