Abstract: A cotton module is covered with a tarpaulin for protection from the elements. The tarpaulin has a plurality of grommets spaced along the peripheral edge thereof. A separate pin is inserted through each of the grommets and held in place by pressure from the fibrous material of the cotton module. Each pin includes a first elongated leg having a sharpened tip which is inserted through the grommet and into the cotton module. A second leg is approximately one-fourth the length of the first leg and extends parallel to the first leg. The second leg is inserted into the cotton module alongside the peripheral edge of the tarpaulin. A bight portion runs between the first and second legs and is devoid of any protrusions which might cause the pin to be knocked loose as the cotton module is transported.