Wudkey 40L Waterproof Travel Backpack, Flight Approved Carry 。??Airline Compliant Size - This personal carry-on backpack meets airline boarding standards, with dimensions of 17.72×14.17×7.87 inches (approximately 45×36×20 cm). It can be easily carried onto the plane and stored under the seat, saving on checked baggage fees. Suitable for both travel and business trips. ??Large Capacity & Multi-Compartment Organization - The travel backpack features a large-capacity, multi-compartment design, equipped with dual main compartments, multiple internal dividers, and an independent padded laptop sleeve compatible with 15.6-inch laptops. The main compartment supports a 180° wide-opening design for convenient access and packing. It also includes a waterproof wet-dry separation bag and a ventilated shoe compartment to keep items neat and hygienic. ??Convenient Luggage Strap Design - The Laptop backpack features a luggage strap sleeve that securely attaches to the handle of a rolling suitcase, making it easy to pull and move through airports, train stations, and other locations during long-distance travel, ensuring a more relaxed journey. ??High-Quality Water-Resistant Fabric - Made from high-density water-resistant material with a splash-proof surface treatment, this casual daypack effectively blocks rain splashes and daily moisture penetration, keeping the contents inside dry and organized, and adapting to changing environments. ??Versatile Multi-Scenario Use - Suitable for a wide range of scenarios, including international travel,