I recently bought an official Thermarest regular size stuff sack for my regular size NeoAir. Sometimes I wish I would have bought the shorty NeoAir, but that's a different story. Anyway, I thought the Stuff sack was a little tight, just like all the other Thermarest stuff sacks I've had for other Thermarest pads. Why do they make those things so tight? I returned the regular stuff sack and got the large. Now I can fold the NeoAir in half instead of in thirds, and fit it in the large stuff sack with no problem. It makes a longer but narrower bundle, and it works better for me. Just thought I'd mention this in case some one else is considering buying an official stuff sack for the Thermarest Regular.