medication zipper hood security bag (red) cardinal bag supplies this medication bag is designed for convenience and security. this type of bag, otherwise known as zipper hood bag, has been popular for many years to secure valuables. its simplicity is based on a unique time-tested method of securing the zipper with a standard padlock. for these secure bags the zipper pull is inserted through a slotted steel zipper hood. the zipper on the bag is then secured by inserting the shackle of a padlock through the zipper pull.