Yes, in 2026, a 20-inch suitcase is generally permitted as carry-on luggage on AirAsia, provided it adheres to their strict "two-bag" policy and weight limit. AirAsia specifies that your main cabin bag must not exceed 56cm x 36cm x 23cm (which is roughly 22 x 14 x 9 inches), so a standard 20-inch bag fits easily within these dimensions. However, the critical "catch" is the 7kg (15.4 lbs) combined weight limit. This weight includes both your 20-inch suitcase and your small "personal item" like a laptop bag or handbag. AirAsia is notorious for weighing bags at the boarding gate, especially on high-traffic routes in Southeast Asia. If your 20-inch bag is made of heavy hardshell material, it may weigh 3kg empty, leaving you with very little weight for your actual belongings. It is a peer-to-peer "pro-tip" to always weigh your bag at home; if you exceed 7kg, it is significantly cheaper to pre-book a checked bag online rather than paying the steep "gate baggage" fees that can often cost more than the original flight ticket itself.