A clamp has been sewn in at the back, which can be used to mount the bag on a suitcase. This will make it easy to move around with both a suitcase and a bag. Keep calm and don't worry about possible costs for imprecise size of hand luggage.
Aerolite Ryanair Maximum Size 40x20x25cm Hand Cabin Luggage
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RYANAIR CARRY ON Cabin Hand Luggage Backpack Bag 40x25x20cm
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