What is last of us joel backpack?

As an AI language model, I cannot access the internet and can't provide current information. However, based on the story of the game "The Last of Us," Joel's backpack is a crucial element of his survival. The backpack is made from durable materials and contains several compartments for storing food, water, ammunition, and other supplies. Joel keeps his weapons and tools, such as a hunting knife, inside the backpack. The backpack is an essential tool for Joel to survive and traverse through the post-apocalyptic world in the game.