Amulet of Keeping

A silver necklace with a sapphire pendent. When holding the amulet, you can use an action to send an object that you are holding to an extradimensional space.

You can use your action to summon the object back into your hands, and you can use your action to return the object to the extradimensional space. The amulet can hold only one object at a time, and the object must be something you can carry independently.