We bought the Aquabourne Moel 30L after looking in cabinmax.com for backpacks Which are good for hiking and so OK as cabin luggage for most of the airlines (Easy Jet included). Unfortunately The Reason Why this backpack fits well into the 55 x 40 x 20 cm limit Is that it is really smaller. It is good for 1-2 days hiking but not for a long trip as we planned, so I will bring with me my old Deuter Giga ... HOWEVER 4 stars Because the product is good and well made, sure a good deal for the Price.