Sports Backpack 50L to 80L Expandable Mutifunction Flight Approved Backpacks 17.3 inch Laptop bags Water Resistant Business Sports BackPack for Women & Men

【50L-80L Expandable Design 】 The oversized expandable backpack offers you a spacious experience. Normal 50 L, size 22.05 (H) x 14.17 '(L) x 8.27' (W) inches. Extended after is 80 L, size is 22.05 (H) x 14.17 '(L) x 14.17' (W) inches. Our suggestion is that an 80L backpack is more suitable for tall people, and it is recommended to be 5.91 feet and above. It is suitable for people weighing 160 pounds or more and a 7-10 day trip. Ideal for hiking, camping, or daily commutes.【Durable Materials】 The backpack is made of durable ballistic nylon+PVC material, providing more secure protection for your belongings.【Keep Everything Organized even your helmet and basketball】 The laptop backpack comes with large-capacity main compartment and one independent shoe bag. It is equipped with an external mesh bag on the outside. The net can hold special items such as basketballs and helmets It is a motorcycle backpack.The main compartment is equipped with dry pocket.it also has a laptop compartment that keep your tech safe.【Iterative Update】 The expandable design and the maximum capacity can be expanded by 40% (50L-80L), and it can store daily necessities for about a week as needed. The backpack also has external straps, maximizing the use of the backpack storage space, and saving an additional 10% of capacity.【Travel Essentials】 The bag body incorporates rigid frame support, while the back panel features a proprietary robotic triangular model design with a large-scale embossed surface and mesh fabric for enhanced breathability. Thick and tender padding, effective back pressure relief, while equipped with adjustable chest buckle, make it easier for you to carry. Its chic look makes it as a travel backpack, computer backpack, work backpack. Perfect for everyday use. superior materials and excellent craftsmanship ensure long-lasting durability.