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Ares' Backpack is a blue nylon backpack given to Percy Jackson by Ares in The Lightning Thief. The backpack is an altered form of the Master Bolt's sheath, made so that the Master Bolt always returns to it. Ares "tinkered" with the backpack's magic so that the bolt only arrived in it once Percy arrived in the Underworld.
- The Master Bolt, once it arrived in the Underworld
- Three sets of fresh clothes for Percy, Grover Underwood, and Annabeth Chase
- A pouch of drachmas
- A bag of Double Stuffed Oreos