This will fit as 18x12x8 carry-on for Spirit Airlines: American Tourister Atmosphera II Overnight Tote | Overnight totes, American tourister, Travel tote bag
American Tourister Spirit Bag Hack - YouTube
Amazon.com | 18" Personal Item Under Seat Basic Luggage for Spirit, AA, Frontier airlines (Black) | Carry-Ons
Buy American Tourister Rolling Travel Tote, Teal, One Size at Amazon.in
American Tourister Speedlink 3 Piece Hardside Suitcase Set in Silver | Costco UK
American Tourister Spirit Bag Hack - YouTube
4 Kix Rolling Tote
Amazon.com | American Tourister Kids' Disney Softside Upright Luggage, Mickey Mouse 2, Carry-On 18-Inch | Kids' Luggage