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I drop the folded and rolled pad inside, then 'reverse roll' the pad to open the center and now the pad is on the wall of the dry bag.  I stuff my down sleeping bag into the center of it and smoosh it down so there is room for the BA AXL air pillow, inflation bag, and my sleep clothes.  This puts all sleep gear in one spot, waterproofs it and you loose the bag and pad stuff sacks for even less gear.

That's similar to what I do. Everything for sleep in one spot. I have a 3/4 Thermarest pad, just the thin one. I use that to protect my food pails in my Granite Gear food pack so if I set the pack down/fall on rocks it won't crack the pails.

I attach that 3/4 pad to my inflatable pad with that double pad mating they sell. That gives me about 3" from knee's up. Unless weight is a limiting factor get the most padding you can afford.