When preparing for a vacation, many passengers try to fit as many items as possible into their suitcase, but they often forget about airline regulations. Some items are prohibited from being checked in due to the risk of fire, theft, or other dangerous situations. ### Power Banks and Lithium Batteries Portable chargers, spare lithium-ion batteries, and batteries cannot be checked in as registered baggage. They are only allowed to be transported in carry-on luggage. The reason is the risk of overheating and fire. If a battery catches fire in the cabin, the crew can quickly take action. In the cargo hold, the consequences can be much more serious. ### Documents, Money, and Jewelry Passports, bank cards, cash, keys, and jewelry should always be kept with you. If the baggage is lost or delayed, the traveler may be left without the most essential items. Additionally, airlines typically do not compensate for lost cash and jewelry that were in checked baggage. ### Flammable Substances Gas canisters, lighter fluids, solvents, and other flammable substances are prohibited from being transported in baggage. Due to pressure changes, they can pose a danger during the flight. However, regular aerosol deodorants and some cosmetic products can be transported if they comply with the airline's established norms. If security personnel discover prohibited items in a suitcase, they may open the baggage to confiscate them, and the passenger risks facing flight delays, confiscation of items, or fines. Before traveling, it is advisable to familiarize yourself with the airline's regulations. A few minutes spent checking the contents of your suitcase can help avoid troubles at the airport and prevent spoiling your vacation.