This is the bottom of the stack pack. Loose footed main so the slugs sewn onto 75mm webbing just slide in the track. No conduit in this shot.
This just laying on the side with the conduit temporarily in place. 4 D rings for the lazyjacks each on 25mm webbing. The rear D ring attaches with a line to the topping lift. The front around the mast is open to let the air circulate. The gap at the rear is for the reefing lines.
The camera angle makes it look rectangular, it's not

This is the top showing the flap and clips. This goes back about a third of the way. The rest is held together by the conduit and when leaving the mooring to go home a line is used to tie it together along with the halyard. I leave the halyard attached and it's held clear of the mast with the same bit of line attached to the SS ring near the second D ring.
I tacked the lot together with a longlife outdoor polyester blue thread. Then sewed the lot with Sairite's Black PTFE Lifetime thread. Not sure whose lifetime they are talking about.
The black thread shows up in the photos but in my sail room, it's damn hard to see on the Captain Navy Weathermax!
There is 50mm webbing under the Weathermax along the flaps. Yes, I will finish off the rope with a hot knife.