Lufthansa's cabin bag allowance is 55x40x23cm, which is one of the more generous European allowances in terms of overall volume. It opens up a good range of Flight Knight sizes - from compact underseat bags all the way up to a full 55x40x23 overhead case.

Lufthansa includes a cabin bag on economy and premium fares, though as always, the exact entitlement varies by fare type and route. Business class passengers get additional allowances.

If you're flying Lufthansa regularly - whether from Frankfurt, Munich or one of their other hubs - it's worth having a cabin case that actually uses the full allowance rather than leaving space on the table. The 55x40x23 is a sweet spot: big enough to pack for a proper trip, small enough to stay carry-on.