Self-Closing Non-Modular Octagons: 28

The self-closing boxes and tatos shown on this page do not have a separate lid and base. Each one is made from a single sheet of paper and collapses closed with a slight twisting motion.
 
The closure remains secure due to overlapping flaps. The box or tato can be opened by gently pulling those flaps apart with a reverse twist.
 
The boxes shown here were designed by Phillip Chapman-Bell (Oschene) and Christiane Bettens (Mélisande), with a few variations of my own. The tatos are a traditional design. All of these models benefit from the use of double-sided paper.