【30L/22.6L, From Travel to Daily】This expandable travel backpack adjusts from 18" x 12.7" x 6" (22.6L) to 18" x 12.7" x 8" (30L), providing flexible storage for your essentials—ideal for 2-4 day trips and daily work. It meets carry-on size requirements for major U.S. airlines like American, Delta, United, and Alaska, letting you travel WITHOUT BAGGAGE FEES. With high-quality SBS zippers, enjoy effortless access and long-lasting durability. (PATENT PENDING) 【No Accidental Opening】Built for security and convenience. It features two auto-lock sliders on the main and laptop compartments to prevent accidental openings. An anti-theft pocket on the back keeps your valuables safe, while a side pocket allows for quick access to your passport—perfect for travel. Plus, the water-resistant fabric ensures your essentials stay dry in light rain. Enjoy peace of mind with this anti-theft backpack! 【Work-Ready, Stay Organized】Features a 17” laptop compartment that fits thick laptops up to 16" and slim ones up to 17". As a multi-pocket backpack, it includes 12 pockets to keep everything organized. Despite its expandable design, there’s a pocket for water bottles up to 3" wide and a USB slot for convenient charging—making it work-ready! Additionally, a large wet pocket keeps your items dry, and reinforced stitching ensures this backpack is built to last. 【3 Ways to Carry, Effortless Packing!】The main compartment of this suitcase backpack opens a full 180 degrees, making packing and unpacking a breeze. The zipper features two sliders for easy access from either side. With padded top and side handles for comfortable carrying and a trolley sleeve on the back to attach it to your luggage, it’s perfect for travel or commuting. 【Relieve Pressure, Travel Better】This commuter backpack features adjustable, breathable padded shoulder straps and an ergonomic back pad for ultimate comfort on the go. The padded straps evenly distribute weight to reduce strain on your shoulders, making it perfect for long commutes or trips. Plus, this carryon backpack made from at least 50% recycled materials, with fabric and lining crafted from 34 recycled PET plastic bottles. Travel sustainably and comfortably! Versatile Expandable Backpack for Commuters and Travelers This backpack adjusts from 22.6L to 30L, perfect for 2-4 day trips while meeting carry-on requirements for major U.S. airlines. Made from water-resistant fabric and equipped with durable SBS zippers, it ensures longevity and easy access. Security features include auto-lock sliders on the compartments, an anti-theft pocket, and a passport pocket. For comfort, it has adjustable, breathable padded shoulder straps and an ergonomic back pad that relieve pressure during long commutes. The trolley sleeve allows you to attach it to your luggage effortlessly. With 12 pockets for organization, a water bottle pocket, and a USB charging slot, it’s designed for modern life. Plus, it’s eco-friendly, crafted from at least 50% recycled materials, including fabric made from 34 recycled PET plastic bottles. Elevate your travel and daily routine with this thoughtfully designed backpack!