British Airways (BA) is generally considered less strict than low-cost carriers like Ryanair or Spirit, but they have become more vigilant in 2026 due to high cabin load factors. Their official allowance is quite generous: one large cabin bag (56 x 45 x 25 cm) and one personal item (40 x 30 x 15 cm), with a combined weight limit of up to 23kg (51lb). This weight limit is rarely enforced unless the bag appears visibly difficult for the passenger to lift. However, the size dimensions are strictly monitored at the gate. If your bag does not fit into the "sizer" metal frame, BA staff will often require you to gate-check it. For "Basic Economy" passengers, this can result in a steep gate-handling fee if they have already reached their limit. In 2026, BA has also implemented a "Yellow Tag" system; your smaller personal item must have a yellow tag and must be placed under the seat in front of you, while the larger bag goes in the overhead locker. If the flight is full, gate agents may proactively ask for volunteers to check their bags into the hold for free to speed up the boarding process.