Discourage cats and dogs from spreading zippers apart with these handy clips. 

For the classic SturdiBag: Bring double zipper heads together, open claw like clip and place in zipper pull holes closest to the chain (see product picture).  

For the Pro 2.0: Open clip and place claw like clip in locking zipper holes.

Caution: The Zipper Safety Clip is not a locking device.