Dreams and visions about a bag tell you about the responsibility you carry with you, the bag is also a reflection of your heart, that what you put in your bag are your burdens, wishes, dreams, your character traits, your true me and the inner and outer knowledge.
Dreams or visions about packing a bag tells you to take the loads with you, loads you might want to let go of. Another explanation is that you prepare for new opportunities and new insights.
Losing a bag in your dream or vision tells you to leave old burdens, emotions, financial problems, your heart or your character traits to look for new opportunities. Another explanation is that you have lost some of your true self or your traits during your quest.
A torn or broken bag in your dream or vision tells you that you have to endure heavy loads. Another explanation is that you get rid of old and negative thoughts and habits.
Theft of a bag in your dream or vision tells you that you feel that someone is taking something from you, checking you, or wanting to manage it. Another explanation is that you deprive yourself of something important, because you are always the thief yourself and you project yourself on both the victim and the thief.