Jet2 is generally considered one of the more reasonable European airlines regarding hand luggage, but they have become increasingly systematic in 2026. Their standard allowance is one piece of hand luggage weighing no more than 10kg with maximum dimensions of 56 x 45 x 25cm. In addition to this, they permit a small personal item (like a laptop bag or handbag) that must fit under the seat in front of you. While they don't always weigh every bag at the check-in desk, ground crews frequently use sizer boxes at the boarding gate. If your bag is visibly oversized or the flight is at maximum capacity, they are very strict about moving the bag to the hold. If you exceed the 10kg limit or the dimensions at the gate, you may be charged an "airport baggage fee" which is significantly higher than pre-booking a checked bag. To avoid issues, ensure your wheels and handles are included in your measurements, as these are often the reason a bag fails the sizer test.