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Stackpacks enable easy furling and stowage of a Mainsail. They are becoming increasingly popular these days, rivalling Sail Covers due to ease of use. Stackpacks usually attach to the boom by one of two methods and the most appropriate method depends on the foot of your Mainsail.

Types of Sail Stackpacks

If your Mainsail is loose-footed, the Stackpack will either have a bolt rope sewn into its bottom edge and slide into the boom groove or make use of sail slides to attach to the boom. If the Mainsail attaches to the boom with a bolt rope, the stack pack will have a tape sewn into its bottom edge and slide into the boom groove under the Mainsail bolt rope.

We supply our Mainsail Stackpacks without Lazyjacks as these are best configured on the boat and are usually installed by a rigger. The Lazyjacks attach to the stack pack by webbing loop, which is sewn onto the sides of the Stackpack. Reefing lines are accommodated for by either zipped access when the mainsail is not loose-footed.

With a loose-footed main, the reefing lines are accessed through the bottom of the Stackpack with access openings incorporated.

Bavaria Cruiser 33, 2013 Stackpack_1

Other Benefits of Sailboat Stackpacks

Another advantage of a Stackpack is that the sail stays furled within its protective cover on ‘top’ of the boom, not draped over the boom. This increases headroom and avoids a Sail Cover, which hangs below the boom and chafes on the Sprayhood.

It also increases headroom in the Cockpit, which is impeded to a certain degree when a Sail Cover hangs down below the boom. Our Stackpacks will usually incorporate a separate ‘boot section’ to cover the mast and head section of the sail; this part can be removed when sailing.

So why a Tecsew Stackpack?

In our opinion, a Stackpack is often subject to rough use being left attached to the boom when sailing. That’s why we ensure our Stackpacks will most often have an additional Lazyjack point each side while, in comparison, our competitors don’t go as far as to provide this. This means less strain on each attachment point, better support for the Stackpack from the Lazyjack system and much better furling and packing away of the main.

Jeanneau Sun Odyssey 349 Stackpack

All Lazyjack attachment points are fully reinforced and we use Jackstay webbing with a 2-ton breaking strain for the attachment points. The rear and forward ends are fully reinforced and we use a fully turned tabling reinforcing for all main edges.

Contact us today on 02392 556548 to learn more about our Stackpack Sail Covers and to discuss the creation of a Stackpack most suited to your boat. Alternatively, get in touch with us by filling out an enquiry form below.

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02392 556 548


Tecsew Ltd, Unit E3 Eagle Building
Daedalus Park, Daedalus Drive
Hants, PO13 9FX

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