How can I save a player's in-game earned gear?

Hai cyclox You can change Tool to anything but you also gotta change in Loading sequence

Saving Below

    if game.Players.LocalPlayer:WaitForDataReady() then
    player = game.Players.LocalPlayer
    player:WaitForChild("Backpack")
    player:SaveInstance("Tool", player:FindFirstChild("Backpack"):FindFirstChild("ToolName"))
    end

Loading Below

game.Players.PlayerAdded:connect(function(player)
    if player:WaitForDataReady() then -- Wait for the player's data cache to load or skip if it doesn't
        print(player:LoadInstance("Tool"))
    end
end)

IMPORTANT: You will have to add the Save feature to activate when the player bought the item