How to make a script that puts items in backpack of player when they join?

local plrs = game:GetService("Players")
local stick = game.ServerStorage.Stick

plrs.PlayerAdded:Connect(function(plr)
    if plr:WaitForChild("Backpack") then
        local dup = stick:Clone()
        dup.Parent = plr:FindFirstChild("Backpack")
        print("successful")

    end
end)

this is my script, I have notice that the script works but the tool is not in the backpack and I don't have a clue where the tool went.