Thank you for viewing! Instant purchase is welcome. We will carefully package and ship promptly, so please consider. 【Amazing Expandability & Smart Large-Capacity Storage】 From a business backpack to a travel bag perfect for short business trips. Expand the capacity from 20L to 30L with a single zipper. It can store A4-size documents, suits, and computer peripherals all together. Furthermore, the self-supporting design makes it incredibly easy to take things in and out. It maintains an organized state without tipping over, even in the office or hotel. Size (before expansion): 45 x 34 x 12cm Capacity: approx. 20L (after expansion): 45 x 34 x 20cm Capacity: approx. 30L 【High-Quality Nylon Material & Excellent Waterproofing and Stain Resistance】 Uses high-quality, tough material suitable for business situations. The high-density 900D leather-like nylon is coated with water-repellent treatment, so sudden rain, splashes, and minor stains can be easily wiped away. It protects important documents and devices from water damage, promising a clean and smart business style in any weather. 【Reliable Protection & Versatile Pockets for Easy Organization】 An independent PC pocket with high-density cushioning and a fixing belt that securely protects laptops up to 17 inches. It reliably guards valuables from impact. Furthermore, with multi-functional divider pockets such as the A4-size front pocket and a dedicated waterproof pocket, everything from documents, tablets, umbrellas, and water bottles can be neatly organized and easily retrieved. A theft-prevention pocket on the back safely stores valuables such as mobile phones and passports. 【Comfortable Carrying Feel & Outstanding Breathability】 Adopts S-shaped shoulder straps to reduce the burden on the shoulders and back. By effectively distributing the weight, it is designed to reduce shoulder pain, even on days with a lot of commuting or travel. In addition, the back is equipped with a breathable structure using 3D mesh back panel material. It eliminates stuffiness and discomfort, realizing a comfortable carrying feel even in hot seasons. 【Travel Convenience & Attention to Detail for Durability】 Equipped with a strap on the back that can be directly attached to the carry bar of a suitcase. Moving around at airports and stations becomes much easier, freeing up your hands and allowing you to move smartly. High-intensity reflective material is placed on the back shoulder straps. It enhances visibility from the front in the dark and strongly supports traffic safety during nighttime travel. Also, daily loads