Where the piece concept applies, generally, two pieces of checked baggage are allowed per passenger, each piece weighing a maximum of 32 kilos (70 lb) and measuring no more than 158 cm (62 in) when adding the dimensions: height + width + length.

The number of bags you can check in 2026 is determined by your airline's baggage policy, your fare class, and your frequent flyer status, rather than a universal limit. Most major "full-service" carriers (like United, Delta, or British Airways) allow you to check up to 10 bags per person on domestic flights, provided you are willing to pay the increasingly steep "excess baggage" fees. For standard Economy passengers, the first bag usually costs around $35–$40, with the price increasing for the second and third bags. If you are flying in Business or First Class, you are typically given 2 or 3 checked bags for free as part of your ticket. For "Ultra Low-Cost Carriers" (like Spirit or Ryanair), you are generally allowed to check up to 5 bags, but each one carries a high fee that must be paid in advance to avoid "at-the-airport" surcharges. It is also critical to remember the weight limit: most airlines cap checked bags at 50 lbs (23 kg) for Economy and 70 lbs (32 kg) for Premium cabins. If you need to check more than 10 bags, you usually have to ship them via the airline's "Cargo" department rather than checking them as standard passenger luggage at the ticket counter.