3 Method Carry-On Travel Bag Brand: Tom Bihn Model: Aeronaut 45 3 Method: Duffle Bag, Backpack, Shoulder Bag 5 Exterior Pockets: 2 side pockets, 2 end pockets, 1 large main compartment Large main compartment has zippered partitions that can be undone to expand the space as needed Hidden backpack straps with hook-ups Attachment points for optional shoulder strap (strap not included) Maximum carry-on size for most domestic flights Excellent condition, used once for a road trip.