Under the Montreal Convention and EU Regulation (EC) 889/2002, if your baggage is delayed, the airline is liable for the "damages" caused by that delay. This typically covers the cost of "essential items" like toiletries, underwear, and a change of clothes while you wait for your bag. The maximum compensation limit is approximately 1,288 Special Drawing Rights (SDR), which in early 2026 converts to roughly €1,600 to €1,700 per passenger. This is not a flat-rate payment; you must provide receipts for your purchases to be reimbursed. If your bag is officially declared "lost" (usually after 21 days), you can claim for the total value of the suitcase and its contents up to that same limit. It is critical to file a Property Irregularity Report (PIR) at the airport immediately before leaving the baggage hall. You then have 21 days from the date the bag is returned to submit a formal written claim for expenses. Note that if the delay happened on your way home, airlines often argue that "essentials" are not needed since you have clothes at your residence.