The bag is long enough to be in it and stretched out (I am 1.87) "packaging" to. In contrast to sleeping bags can be felt almost immediately reflected by the aluminum coating body heat. Very soon there will be damp due to the breathing air, but not clammy. The material isolated apparently excellent, with uncoated plastic products are located on the other hand quickly in a dank bag. Anyway, to the moist breath can invent anything.
Mechanically, the bag compared to about a rescue blanket very stable, there is evidently a polyethylene film, which is on both sides of aluminum coated, crumple doing nothing. The whole after use even remotely fold back to its original dimensions, to me has not been possible even though the applied yellow stripe here are very helpful. But I would not expect anything else: If the pack size to be a problem, you can also set more of it at the rate for the emergency.