At Deuter site they describe their Aircontact Core series as “comfort at its core”. My guess is there is more about it regarding the word core in the name.
Deuter packs
What Does the “+10” Mean in Those Deuter Backpacks?
Deuter has developed its own design of classic top loading packs with a lid that allows for extra volume when needed, and they have been using it for years in many of their backpacks series.