Under the Montreal Convention, which governs international air travel including within Europe, you can claim up to approximately €1,600 to €1,800 (roughly 1,288 Special Drawing Rights) for expenses related to delayed or lost baggage. If your bag is delayed, the airline is responsible for reimbursing you for "necessary" and "reasonable" expenses—such as basic toiletries and essential clothing—that you had to purchase because your belongings were missing. It is crucial to report the delay at the airport immediately and obtain a Property Irregularity Report (PIR). To receive reimbursement, you must submit a formal written claim to the airline within 21 days of receiving your bag back. Keep all original receipts for your purchases, as the airline will typically not provide a flat fee but rather a direct reimbursement for proven costs. If your bag is not returned within 21 days, it is officially considered "lost," at which point you can claim for the total value of the contents up to the aforementioned maximum limit.