16 inch aerolite carry on hand luggage flight duffle bag, 2nd bag or underseat, 19l aerolite <p><b>designed specifically as approved personal item size on delta airlines, southwest airlines, united airlines, jetblue airways, wow, spirit airlines, frontier airlines, virgin america & sun country</b></p> <p>the bag features a back strap which conveniently slides down the handles of your suitcase trolley handles, meaning you can carry both your main carry on luggage and your underseat bag with great comfort</p> <p> </p> <p>the bag features a dual zip design which come with a mini padlock which can lock your zips together in order to prevent the bag being opened by non-key holders. the bag will fit 13" laptops and below, making accessing them during your flight very convenient.</p> <p> </p> <p>an adjustable shoulder strap means you can carry your bag on your shoulder, or by using the top tug handle.</p>