50 pounds is the usual weight limit. The largest checked international luggage size allowed is 62 linear (total) inches. Typically, a standard checked luggage size wavers around 27 x 21 x 14 inches. The universally accepted carry-on luggage size for a domestic flights (within the U.S.) is 22 x 14 x 9.

For international air travel, "the box" usually refers to the IATA-standard baggage sizer used to determine if a carry-on bag is permitted in the cabin. The most common "maximum" size for a standard carry-on is 56cm x 36cm x 23cm (22" x 14" x 9"), including handles and wheels. However, this is not a universal law; budget carriers like Ryanair or AirAsia may use smaller "personal item" sizers (40cm x 25cm x 20cm). If you are referring to a shipping box (Check-in baggage), most airlines allow a total "linear size" (length + width + height) of 158cm (62 inches). For specific international shipments via cargo (like DHL or FedEx), "Standard Box 1" is typically 48cm x 40cm x 38cm. In 2026, many airports have replaced physical metal sizers with 3D optical scanners that measure your bag in seconds as you pass through security. It is vital to check your specific airline's "Contract of Carriage," as exceeding these "box" dimensions even slightly can result in an "oversized baggage fee" that can cost upwards of $100 per segment on international routes.