When we used both these airlines, we had to check luggage that are considered carry on by most airline standards. BMI- I had to check my roll aboard (too large). They let my husband carry on his RS pack but only because it was not full and went under the weight limit. Easy Jet- we had to check them both and carried on a backpack with emergency items that we could not get through one night without (a couple pair of clean underwear, prescriptions, glasses, camera, etc.) Overall, these smaller budget airlines (Easyjet, BMI, Ryan) are stricter than the larger airlines (American, British Air, etc) Look at their size and weight restrictions carefully...they do enforce them. (Disclaimer: BMI last used in 2002, Easyjet 2003 so my experience is somewhat dated)