Hello nan00Se
You are allowed to take one piece of hand luggage onboard - so you might be best off taking a rucksack with your handbag inside it if you need that too. In total, this bag should weigh no more than 5kg.
This information will be in your final documents, sent about 2 weeks before you travel:
"In addition to your checked baggage allowance, you are allowed to take one piece of luggage per person inside the aircraft cabin, weighing no more than 5kgs. The maximum dimensions of your hand baggage must not exceed 56cm x 45cm x 25cm, including the handles, pockets and wheels. Your bag must fit into the bag gauge, available at the check-in area."
Kind regards,
Olly, your editor