LOL! I love your question, Karen. I hope you do ask the cabin steward your question. Actually, Don & I used 2 gal. Glad Baggies for our jackets, vests, safari clothes, etc., to aid us in meeting the small duffle (& 26 lb.) packing criteria for the Botswana part of the ROAR trip. We put them on the floor, rolled & smashed the air out of them with a knee. It worked beautifully for us. Space Bags should work better with a better sealer. - :) Michele