Do not disregard the information below even if you are acquainted with Vueling Airlines baggage allowance & cabin bag size in terms of size and weight. And check out best CabinZero backpacks for Vueling flight.
Personal Items:
40.64 x 30.48 x 15.24 cm / 16 x 12 x 6 in
Cabin Size:
55 x 40 x 20 cm / 22 x 16 x 8 in
More details on Vueling baggage allowance, check here.