Thermos of Winds

Hermes gives Percy a thermos that contains the winds of the four cardinal directions: North, South, East, and West. The lid is also a compass where the hotter side points to North. It has a picture of Hercules on it. Percy lets one wind go to gain speed to catch up with Clarisse, another to get away from the Princess Andromeda, and the rest to fall away from the center of a whirlpool when they were entering the Sea of Monsters. It is based off of Aeolus' bag of winds. Percy later finds it completely empty.