The personal belong

Email at work:
"Attention all staff members. 
Just a reminder to all staff to keep your personal belongs in a safe place.
This afternoon we experienced a theft of a Mobile Phone and a pair of sunglasses from a bag in one of the clinic rooms.
Please be aware that this could happen to you as well.
Thanks for your vigilance"

My thoughts:
"I don't know what a personal belong is.  Is it a person who belongs to me, with me, within me?
I shall be vigilant, I shall be on the lookout for this personal belong...."