To dream of large stainless steel thermos flask means:
You have to prepare for cold climate. This has double meaning. Being in a cold climate implies hardship facing the natural elements of weather of the environment. Dream imagery of a large thermos flask means you are storing hot (or warm) liquid for use because you require this. The detail of the dream imagery, like the flask being of stainless steel, suggests basic, rudimentary tool. The surrounding is simple, rustic, rural and only the simplest basics are available. On the other hand, the simple aid may be because the dreamer is unable to afford more costly and complex equipment like an electric thermos flask.