I haven't seen the details the way North does it, but having the main rolled up alongside the boom (zipped on top) is a good way to go on large sails, IMHO. I'm not a fan of seeing the Stack Pack sailcover hanging loose from the lazy jacks alongside the lower main.

In our case, different from the Stack Pack, the cover slides into a slot on top of the boom (main is loose-footed) and the cover sits inside the lazy jacks with the sail. It has just one batten in it and rolls up alongside the boom when sailing, secured by shock cord loops and hooks (both attached to the bottom of each side) about every 5 or 6 feet. It also has long narrow mesh panels along the boom on each side so water drains, and for a bit of ventilation. It has a loop sewn in on one side near the top of the area that covers the headboard, so I can clip on the halyard, raise it by hand and the one side is held up while I climb (2 mast steps) to reach the top of other side, which is way above my head when standing on deck, and start zipping it.

Opened loose:

Rolled a bit (in this image it was a looking sloppy because I only fastened one or two of the shock cords on each side):