Here's the system I made to couple two NeoAir pads and attach our MYOG Love Bird Quilt to the pads.
• Secure the pads to each other with no gap in between.
• Secure the quilt to the pads.
• Make it easy to attach and detach the system.
• Allow me to 1) leave the quilt unattached for warm weather, 2) attach the edge of the quilt to the edge of the pad for cool weather, or 3) cinch the quilt under our bodies for cold weather. The system is functionally like Katabatic - and is, I think, the best way to stay warm with a top quilt, as shown in the diagrams on the Katabatic Gear website - katabaticgear.com/design/
On our prior double-quilt, we attached the quilt to the pad-couplers using velcro. The design was easy to use, but the velcro was in a fixed location so we couldn't pull the bag in under our bodies in cold conditions. When I made this quilt I wanted a system that was adjustable.
Two couplers. Each made with 85" of 3/4" gros-grain ribbon. Finished length is 40.5".
Two 3/4" Center Release Buckles on each coupler, male half, pointing toward the outer edge of the pads.
Female half of the buckles are sewn to the edge of the quilt. The fitting points outbound, and the hole (where the male fitting snaps into place) points DOWN toward the ground.
When you fold the edge of the quilt under to attach it to the strap, the female fitting on the bag mates with the male fitting on the strap.
The male fitting can slide along the strap, so we can cinch it snug when it's cold.
We marked our pads with the strap location so we don't have to fuss with it to get it right every night.
It uses the same materials and concept that Nunatak uses, but on his bags the straps are not attached to the pad, so that if you roll over you need to keep the quilt centered above you. With this system, the quilt stays in place when you roll around.
We use two couplers. One is at the armpit, which allows me to put my arm out without unclipping, although I do unclip to get in and out of the tent. The second is at my upper thigh.
We've used it for five nights and it was just great. The only downside is that the grosgrain ribbon is not stiff enough to prevent the sliding buckle from crinkling or folding the gros-grain. It's not hard to keep everything aligned, but you do have to pay attention. Edited Feb21: Quest Outfitters sells gros grain ribbon in FIRM or SOFT. Turns out the yellow gros grain was of the SOFT variety, thus the crinkling. I've now built with FIRM gros grain and it is better.
Each coupler and associated female bit weighs 16 grams.
Edited Feb5: In my original post I had a loop lock between the two pads to form the figure 8, but after using it decided it doesn't work as well as my old method, which was just to stitch the grosgrain together. I pulled out the loop lock and now I just stitch the grosgrain with a 1.5" vertical wall - photo below:
View from inside the bag, about to attach the quilt to the coupler.
View from inside the bag, with the buckle out at the edge, when the weather is fair.
View from inside the bag, with the buckle cinched in under the shoulder, when the weather is colder.
Overall view of the system, with the head end of the quilt folded back to expose one of the couplers.