Yea I suppose your right. But I'll give up a couple ounces for a could nights sleep. I'll get the 78x20 size. It will add 3ozs to the overall weight of my pack but it will be 1" thicker, it's R value will go to 5 from 4 and I "hope"the vertical and horizontal tubes will be more supportive than the Air Core BA I've been using. I've had nothing but perfect results with BA inflatable pads so far! (knock on wood) Been using the same BA Air Core Pad for 6 years with never a failure so I'm kinda depending on the new Q-Core to there for me like it's older brother has been. My sons BA Air core is going on 4 years with perfect results also.