Cabin Luggage allowance for UK frequently used airlines :
British Airways - 56 x 45 x 25 Free
Easy Jet - 45 x 36 x 20 Free
Up front or Extra legroom seat can also bring on board: 56 x 45 x 25
Ryan Air - 40 x 20 x 25 Free
Priority boarding passengers will be permitted to take one small bag (40cm x 20cm x 25cm), plus a larger cabin bag (55 x 40 x 20cm) with a maximum weight allowance of 10kg into the cabin free of charge.
We recommend you check with your airline the cabin size allowance