Yes, you are legally entitled to compensation from Ryanair if your luggage is lost, delayed, or damaged, under the rules of the Montreal Convention. If your bag is delayed (not delivered upon arrival), Ryanair is responsible for reimbursing you for "essential items" like toiletries, underwear, and a change of clothes—provided you have the receipts. If the bag is not found within 21 days, it is officially declared "lost," and you can claim for the value of the bag and its contents up to a maximum of approximately €1,900 (1,519 SDRs). It is critical to report the issue at the airport immediately and obtain a Property Irregularity Report (PIR), as you cannot file a claim without this document. You must then submit a formal written claim via the Ryanair website within 7 days for damaged bags or 21 days for delayed ones. Note that airlines rarely pay "new for old" value, usually applying depreciation based on the age of the items.