How Do I Make This Script Only Give and Remove 1 Single Sword?

I made a script that Gives a sword when you enter an area (touch the part that fills the whole area) and remove it when you arent touching anymore and it seems to be giving me another sword once I select the sword. And when I leave the area only 1 sword gets removed leaving players with another weapon in an area where there shouldnt be a weapon.

local IsTouching = false

script.Parent.Touched:Connect(function(hit)
    local hum = hit.Parent:FindFirstChild('Humanoid')
    local plr = game.Players:GetPlayerFromCharacter(hit.Parent)
    if hum and not IsTouching then 
        IsTouching = true
        game.ReplicatedStorage.Sword:clone().Parent = plr.Backpack
    end
end)

script.Parent.TouchEnded:Connect(function(hit)
    local hum = hit.Parent:FindFirstChild('Humanoid')
    local plr = game.Players:GetPlayerFromCharacter(hit.Parent)
    if hum and IsTouching then
        IsTouching = false
        plr.Backpack.Sword:Destroy()
    end
end)