Sandstorm in a bottle lets you double jump as you explore the world.

Having the ability to double jump is important early in the game. When you start out, you must either hunt or craft items to give you a head start as you explore and search for items in the various biomes of your world.

This item can be obtained when you throw a pharaoh's mask into shimmering liquid. Doing this turns your mask into the Sandstorm in a Bottle accessory.

So far this is one of the best accessories you can have for increasing your jump height as well as giving you the double jump ability.