score:6
I actually found found the page in Italian which is way more helpful and it is in fact a translation issue and work backpack
doesn't mean more than a normal backpack.
It is said :
In aggiunta ITA Airways ti consente di portare un accessorio a scelta tra i seguenti:
- Zainetto
- Borsetta
- Pc portatile
Which is the same thing as above, with Zainetto meaning backpack and Borsetta meaning handbag
A drawing of the allowance is also present on that page