Luggage Allowance - TUI Airways

What the official page says

You can take one piece of hand luggage per person, excluding infants. Each piece of hand luggage can weigh up to 10kg and fit within the maximum dimensions of 55cm x 40cm x 20cm. You can also bring one small personal item or laptop, which must be stored under the seat in front of you. The maximum dimensions for this are 40cm x 30cm x 20cm.