Carry-On Luggage Sizes for UK Airlines (2026): BA, easyJet, Ryanair, Jet2 & More Compared

Cabin bag rules at UK airlines now range from a free 40 × 20 × 25 cm underseat bag at Ryanair to a 56 × 45 × 25 cm overhead case at British Airways and Jet2 — here is the full 2026 comparison, the weight rules, and how to measure your bag before you get to the gate.