A typical carry-on bag size limit for most airlines is around 22 inches high by 14 inches wide by 9 inches deep (56 cm x 35 cm x 23 cm), including handles and wheels

. This size is designed to fit in the overhead bin on airplanes. Different airlines have slightly varying size and weight restrictions. For example:

• United Airlines: 22 x 14 x 9 inches (56 x 35 x 23 cm)

• American Airlines: 22 x 14 x 9 inches (56 x 35 x 23 cm)

• British Airways: 56 x 45 x 25 cm, up to 23 kg

• EasyJet: 45 x 36 x 20 cm for free cabin bag; larger size 56 x 45 x 25 cm available with upgrade

• Emirates: 55 x 38 x 22 cm, weight limits vary by class

• Many other international airlines have similar dimensions, usually around 55-56 cm height, 35-45 cm width, and 20-25 cm depth, with weight limits ranging from 7 kg to 23 kg depending on the airline and class

In summary, the common carry-on bag size is about 22 x 14 x 9 inches (56 x 35 x 23 cm), but it’s essential to check your specific airline’s rules before traveling since sizes and weight limits can vary