A travel writer tested “Sudoku Packing”, a social-media trend designed to help passengers comply with Ryanair’s restrictive free hand-luggage allowance. The method limits travellers to nine co-ordinating garments, aiming to create numerous outfits without paying extra baggage fees.

Ryanair permits one free under-seat bag measuring 40 x 30 x 20cm, while easyJet’s equivalent allowance is 45 x 36 x 20cm. The approach uses three tops, three bottoms and three layers arranged in a 3×3 grid, which supporters say can produce up to 27 top-bottom-layer combinations; influencer Natalie Shaquer’s tutorial received more than four million TikTok views.