Kanga's pocket apparently closes with a button.
The books mention her "buttoning" and "unbuttoning" her pocket on a few occasions, although no buttons are visible in the illustrations

• Kanga was originally voiced by Barbara Luddy, Julie McWhirter, and by Patricia Parris from 1989-1991 and is currently being voiced by Kath Soucie

• Roo was voiced by Clint Howard