Yes, in the world of airline terminology for 2026, any bag that fits entirely under the seat in front of you is classified as a personal item. This typically includes small backpacks, laptop bags, purses, or tote bags. Standard dimensions for a personal item are usually around 18 x 14 x 8 inches, though this varies slightly by airline. If your bag is small enough to be stowed under the seat, it is free on almost all "Full Service" carriers. However, on "Low Cost Carriers" like Spirit, Frontier, or Ryanair, the personal item is the only bag you get for free; if your "underseat" bag is too bulky and an agent forces you to put it in the overhead bin, they will reclassify it as a "carry-on" and charge you a steep fee at the gate. To be safe, always check your bag against the airline's "sizer" box before boarding. As long as the bag doesn't obstruct your foot space and the flight attendants don't deem it a safety hazard for egress, you can comfortably count your underseat luggage as your free personal item.