The hip flask is a drink kept hidden close to the body, and tradition reads it as private comfort or a secret reliance. It can stand for courage borrowed rather than felt.
When this appeared in your dream, what were you feeling?
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.