Attach the pinch twist around the bottom (White) balloon. As in the picture you can see the two outer bottom bubbles push out when the pinch twists are attached, to over come this thread the rest of the 160 through the centre of the bag, pull the two outer bubles together and twist the 160 around the pinch twist at the other end of the bag.

There are quite a few variations for the handbag catch, a nice simple one is to Inflate a second 160 or you may have enough from the first 160 balloon if you leave a shorter handle.
Twist a 2 finger bubble followed by two, 1 finger pinch twist and then the second 2 finger bubble. Attach the two pinch twists around the centre top softish 1 finger bubble that you left between row three and four.