Your belongings in a dream are traditionally read as pieces of identity — what you have gathered and what you feel defines you. Losing them often points to a wish to travel lighter, or a fear of being stripped back.
Has this come up in your dreams before? What was going on in your life then?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.