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Replace your setup with a foam army mat instead of an underquilt.
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It's not the same.
I used to use a huge camp pad that Walmart sold, maybe 3/4" thick amd something like 25"x78". That did pretty good and came up around my shoulders, but was bulky to pack and not the warmest.
I have an Exped Down 9 (something like that, it's been discontinued) inflatable pad. That has a real high R value and packed small. Not as wide as the foam pad, work best in a double hammock vs, say, an Eno single.
I got Eno's "warmest" under quilt, which I think is only rated for 45° and is just synthetic cotten-like batting. It doesn't compress the best for packing, but was cheap(ish) and off-the-shelf at an REI. I like it a lot, it used it just this past weekend with a high-30°s overnight low.
I do have a great top quilt, down with a built-in down hat.
My strategy for packing is getting half of my stuff in the bag and then pressing in the under and over quilts without compression sack, just working them loose into the nooks and cranies of the bag.
I do have a big bag, 80l Acy'tyrex. It's never packed full and I do cinch the compression straps in a lot. A 60l bag would probably hold my weekend kit, but I like the extra room if I need heavier coats. Nothing mounted outside except maybe my trekking poles if I'm not walking with them.
I'll try digging up actual part numbers tomorrow.