Got a sewing machine?
Just went to the Mack Sails site to read up on the Mack Pack (never heard of it before) and discovered the following:1. If you're the do-it-yourself type, it appears you could make the whole sail cover for about $65 (Sunbrella $20, Zipper $30, Fittings $15)2. The Harken Lazy Jack system is available almost anywhere around $180 for a 34' boat.1+2. Total DIY price: Less than $250?3. Won't the zipper chafe the sail?4. If you roll down the Mack Pack to keep the zipper off the sail and tie it to the boom, isn't that more trouble than a sail cover?5. If you remove the forward end fitting from the mast, you will have to furl/roll the cover to keep it from banging on the mast under sail; unless, of course, you don't mind the banging.Suggestion: Actually time yourself from sail down to cover on. I am betting you will find it takes far less than 20 minutes. On the other hand, nifty rigs are cool, too! But for $540 I would buy, oh, a GPS, or a sextant, or refridgeration, or another set of custom berth sheets, or a used spinnaker, or, well, you get the idea.Let us know what you decide!