Why this answer
The verdict comes from all three measured axes.
Baggallini Soho Backpack is over the published personal-item dimensions, but the soft construction may make it a borderline option if lightly packed. Treat this as a fee-risk result.
The selected rule is 15.7 x 11.8 x 7.9 in and the bag record is 15.8 x 11.5 x 5.5 in.