The reason the sail came with a tubular bag is that mylar sails don't like being bend or creased much at all. A good way to destroy the sail is to flake and fold it...
What we've done in that kind of situation is to use the dock as area to roll the sail up on. The dock is probably long enough, provided you keep most of the sail on the boat until you're actually rolling it up... and then you can put the bag over the end of the rolled sail and slide it down the sail to bag it.
It will probably require three people to do this... or so. Two to actually roll the sail, and one on-board the boat to help feed it over the lifelines.
__________________
Sailingdog
Telstar 28
New England
You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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