TilleyEndurables LTM6 Airflo Hat

How do I tie knots for chin and back strap?

Proud owner of the Tilley LTM8, best hat I have ever owned. Looking to add one ... what is the difference between the LTM6 and the T4MO?

CAN YOU PACK THIS HAT?

the circumference of my head is 23 inches. what size should I order?