A carton is read as something portioned and packaged for daily use, like milk or juice. Dream books link an empty one to supplies running low and a full one to ordinary care being in place.
Where in your waking life have you met something like this lately?
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.