Help Welding Backpack to Characters Torso?

The backpack is a MeshPart and just spawns where it was placed before moving it into the ServerStorage.. It spawns, I assume just not welding correctly.

			if loadout[class][1] then
				if rank=="Ranker" or rank=="NCO" then
					--Backpack
					local back=storage.Backpack:clone()
					local weld=Instance.new("Weld")
					weld.Parent=back.Pack
					back.Pack.Weld.Part1=chr:findFirstChild("Torso")
					back.Parent=chr
				end
			end
		end
	end)
end)