Im trying to make a backpack script but Wheat does not seem to increase in value on the textlabel?

This is because you have only set the textlabel once in the script meaning it would only run once. If you want it to change: use the Changed event like this:

    local BackPack = script.Parent.BackPack

    local Player = game.Players.LocalPlayer

    local Wheat = Player.leaderstats.Wheat

    local Storage = script.Parent.Storage.Value

    local Storage = "25"



    BackPack.Text = Player.leaderstats.Wheat.Value.."/"..Storage
    Wheat.Changed:Connect(function() -- when wheat changes it will fire this function
        BackPack.Text = Player.leaderstats.Wheat.Value.."/"..Storage
    end)

    if Wheat.Value == Storage then return end