Maru’s bizarre habit: Going on patrol when there is something on his head

Here are the seven times Maru has gone on patrol when something was on his head:

First video - bubble wrap

Photos - paper bag

Photos - Little Red Ridinghood Maru

Photos - Bigger paper bag

Photos - the same bag as last time

2nd video- his favorite bag

Photos - rice cake container

Can anyone explain Maru's strange behavior?