Pete, The sail that you are questioning would be a spinnaker. These sails are set flying and are difficult to handle. There is always the risk of the sail getting dropped in the water and the boat sailing over it. To overcome this problem at least when hoisting the sail it was “set in stops.” The long sausage that you show being handled by the crew is the sail with the stops tied around it. After being hoisted the sheet and guy would be used to spread the sail and the stops would (hopefully) break.
I sailed as crew on two offshore racing (36-40ft) boats) in the 1990’s. By that time spinnakers were not set in stops. Instead the sail was packed below decks into a canvas box with the head, tack, and clew sticking out through slits. The foredeck crew attached the halyard, sheet, and guy each time the sail was hoisted. There was often some debate about which side the pole would be on because the spinnaker had to be ready to hoist when we rounded the leeward mark.
I have no experience handling one of the relatively new asymmetrical spinnakers.
Roger