Lay the color side down and begin to fold all the scores (pre bent pieces) inward.

 

Fold the bottom by inserting the tab into place and the shape will take form.

Continue to insert the tabs along the curved edge to create the sack. Keep the end of the curved piece bent in the opposite direction, it will fold into the shaft.

Connect the tab into the shaft to lock the sack in place. 

Finish by folding the tip into the tabs on the sides and lock with the tab in the middle.