A vacuum-insulated container (thermos) used to keep liquids hot or cold for extended periods.
毎朝、魔法瓶にコーヒーを入れて会社に持って行く。
Every morning I put coffee in a thermos and take it to work.
冬のキャンプでは、熱いスープを魔法瓶に入れておくと便利だ。
On winter camps it's handy to keep hot soup in a thermos.
古い魔法瓶はレトロなデザインのものが多い。
Old thermoses often have retro designs.