Originally Posted by
MichielR
LH
describes the personal item as:
Another small item of baggage (max. x=30 cm y=40 cm z=10 cm, e.g. handbag, laptop bag).
In practice, this means that it has to fit under the seat in front.
Which means it can be a pretty sizable backpack - I never had problems entering the plane with a rollerbag (cabin dimensions) and a backpack which is a bit bigger than laptop size, but much more than the 10cm depth indicated.