Sew a Simple String Drawstring Backpack

Turn the bag right side out. Push the bottom corners all the way out. Place one triangle piece on each side of the bag.
Place a grommet or eyelet through the reinforced bottom corners of the bag, going through all layers, approximately 1” from the corner. (If you are using an eyelet, make a tiny hole where you want to place the eyelet to allow the punch through all the layers before squeezing the eyelet into place.)
The photo is the tool used to attach eyelets to the bag. The tool comes with eyelets and assorted snaps. Buy Dritz® Gripper Plier Kit For Assorted Snaps at Joanns.com