BoardingBlue 17" x 13" x 8" Free BACKPACK Under Seat BoardingBlue 17" x 13" x 8" Free BACKPACK Under Seat Backpack Size: 17" x 13" x 8" One front pocket Friendly Reminder: Please Do NOT Pack Too Much. Or It may cause the bag oversized. Ideal for American, All Nippon, British Airways, Frontier, Spirit Airlines as personal item