How come "FindFirstChild" doesn't work when a tool is equipped?

I've been working on code for ROBLOX, where the player is checked if they have an item. I use the code: local tool = player.Backpack:FindFirstChild("Tool") if tool == nil then print("Player does not have tool") else print("Player has tool") end

But whenever the player has the tool equipped, the code returns nil. Can someone help me with this? Thanks.