Pegathy has a stack pack made by Chesapeake sailmakers. It's wonderful. Head to wind, drop the main, zip it up.
Well, not quite that easy, usually have to push the sail of the top edge of the pack and inside, but close. The front comes off and the pack can be lashed to the boom for racing, with the jacks tied along the mast for minimal windage. This requires a loose foot main. One of the most beneficial improvements I've made to the boat. Dan SheerPegathy - LF38Rock Creek off the Patapsco
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