Foldable 17.5 Inch Laptop Carry-on Briefcase on Wheels & Travel Backpack Luggage Set, Under the Seat Airline Personal Item for Spirit, Frontier, American, Delta, Southwest and Many More
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Travel Backpack @ Briefcase on Wheels Set 
https://www.amazon.com/vdp/00adbfb7dfc74783960220525098b890?ref=dp_vse_rvc_0
UNDERSEAT PRO
{"Product Dimensions": "17.5 x 14 x 8 inches", "Item Weight": "9.81 pounds", "Item model number": "SCBPSETBK"}