While searching the web for options concerning self-storing mainsails, I ran across the Mack Pack. Anyone out there who has used or is using this device to cover and store their mainsail? We're sailing the 40.5 but would be interested in anyone who has information regarding this particular system. It is manufactured by Mack Sails out of Stuart, FL and they have a website that is fully descriptive. Thanks in advance for any help.