Free on Board Backpack; The Perfect Travel Companion. Our backpack combines durability, comfort, and functionality for any journey. Made of polyester, the backpack meets the carry-on luggage requirements of popular airlines, including Ryanair and Wizz Air (40x30x20 cm), making it an excellent choice for onboard travel. Thanks to its spacious compartment and thoughtful interior organization, it will hold everything you need during your trip. Who is it for? Perfect for frequent flyers who value comfort, functionality, and excellent space organization. Our tip: The luggage hook allows you to easily attach the backpack to your suitcase. Key features: Its compact size (40 x 25 x 20 cm) makes the backpack perfectly fit the carry-on luggage requirements of popular airlines, including Ryanair. Dimensions refer to the standard version, without expansion. Laptop compartment: A separate compartment (20″ x 29″, 14″) with a Velcro strap keeps your electronics safe. Capacity: Expandable by 4 cm for additional space and packing flexibility. Material: Made of polyester, this backpack is wrinkle-resistant and durable. Main compartment: The interior of the main compartment, which opens like a suitcase, features adjustable straps, an elastic band pocket, a zippered mesh pocket, and two functional compartments. Composition: 100% polyester; lining: 100% polyester. Comfortable and functional features: Adjustable shoulder straps: Padded shoulder straps guarantee comfortable carrying, and their adjustment allows you to adjust the backpack to your individual needs. Hip belt: Helps relieve the strain on your back during long journeys. Vertical luggage handle: Makes it easy to attach the backpack to the frame of your suitcase. Additional Pockets: The front of the backpack features three zippered pockets, perfect for storing valuables. A pocket on the back is perfect for storing your most important documents. The side, expandable pocket is perfect for an umbrella or water bottle. Invest in comfort and functionality; choose a Free on Board backpack that meets airline regulations. The airlines listed in the description include the dimensions of the backpack in its basic form, without expansion.