Measure and weigh your hand luggage before coming the airport.

You are allowed to bring 1 piece of hand luggage of a maximum of 10 kg per adult/child.
A purse, laptop bag or camera bag also counts as 1 piece of hand luggage. Combine these before you arrive at the airport, so you are only travelling with 1 piece of hand luggage.
Place valuables such as travel documents, electronics and/or medicines in a separate bag. This way, you can easily remove these items and keep them with you during the flight if your hand luggage ends up being transported as hold luggage.

https://www.transavia.com/en-EU/service/hand-luggage/

כמובן שבישראל הכל יכול להיות אז אני לא מתחייב על מה קורה בפועל.