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Yeah...even though it looks like a mummy, BA calls it a rectangular bag.

If you haven't already been to the BA site, check it out. Very helpful.

A Thermarest won't fit in a BA mummy...it takes a tapered pad.

BAs get discussed from time to time, here. Do a search, and you'll be richly rewarded.:)

I'm lukewarm on mine...it takes some doing to keep the pad under my feet.

As for pads, I've tried...