The most common personal item size limit is 18 x 14 x 8 inches (46 x 36 x 20 cm). If your backpacks or handbags don't exceed this number, you're good. Weight limitations for personal belongings are also regulated by several airlines ranging from 10 to 25 pounds (around 4.5 to 11 kg).

Most major full-service airlines do not strictly enforce a weight limit for a personal item, provided the passenger can lift the bag into the overhead bin or it fits comfortably under the seat. However, the bag must strictly adhere to dimensional limits, typically around 18 x 14 x 8 inches. In contrast, many budget and international carriers (such as Air Asia, Lufthansa, or Virgin Atlantic) do impose weight restrictions, often ranging from 3kg to 10kg. Some airlines, like British Airways, are remarkably generous, allowing up to 23kg for a personal item as long as it meets the size requirements. For many carriers in 2026, the weight of the personal item is combined with the carry-on bag for a total limit (often 7kg to 12kg). It is vital to check your specific airline’s "Conditions of Carriage" before arriving at the airport, as gate agents—especially for low-cost carriers—may weigh your backpack or tote to ensure it doesn't exceed the safety limits for the under-seat area.