You will need to piece the front/back part together by taping them. It will read place on fold if attached correctly. The printing is for a standard page.
Press seams of pocket 1/4 inch.
Sew the top 1/4 inch over.
place the pocket in the middle of the front piece.
Top stitch around leaving top flap open.
You can make your own straps or purchase it from the fabric/craft store. 2 yards should be enough.
For the straps I cut 2 strips 3in. by 28in. long and sewed them right sides together. I pulled it through with the loop thing shown above and ironed them flat.
Fold an end of the strap over an inch and sew a square evenly on the back panel. I lined them up 2.5 inches down from the top and 4 inches from the sides. Line the other end with the darts on the bottom and topstitch.
Sew the front and back panels right sides together.
Sew the bottom circular piece right sides together starting at any point. Make sure to get the straps in...
Create a liner by cutting another front and back piece and 1 bottom. Repeat the steps to make the liner but without the straps, you can add the pocket for more storage.
Flip the liner inside out and sew right sides together leaving about a 4 inch hole so you can pull it through.
At this point you can hand sew a snap for a closure and be done...
or...I wanted a draw string so I made a strip that measured all the way around the back pack and 4 inches in width. I then pressed the edges 1/4 inch over and then pressed the whole strip in half.
At the half way point sew 2 button holes on the front half of the strip about 1 inch apart. You can do grommet holes if you have the plier set.
Pin around the edge...
Hand sew the trim edge so you keep the opening for the drawstring.
Pull a drawstring through one buttonhole to the other. You will have to guide it through by placing a safety pin on one of the ends...