A food container is read as planning and taking care of yourself ahead of time. Dream books also see leftovers kept in it as feelings saved to deal with later.
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.