This is a B4-size business backpack made by Acegene. It has been used for about 3 years, so it shows signs of wear, but there is no damage to the zippers or handles, and it is fully functional. (Please understand that this is a used item before purchasing.) - Water-repellent (water-stop zippers) - Dedicated PC space - 2 compartments - Size: 45.5 x 32 x 17 cm ------------------ This B4-size backpack is perfect for commuting on days with a lot of luggage or for travel. It comes with a chest strap to prevent it from slipping while wearing, making it ideal for cycling commutes. The main material is nylon fabric with a highly water-repellent Teflon/Sire finish. Some zippers, such as the main opening, are laminated to prevent water from entering the interior. (※This is not completely waterproof.) The main compartment has pen holders and a smartphone pocket, and the back compartment has space for tablets like iPads and thin PCs. There are two outer pockets on the front of the bag, convenient for storing small items that you frequently take out. There are also pockets on both sides for storing folding umbrellas and PET bottles. The back is made of mesh fabric, which is breathable. It also has a set-up function, which is useful for business trips and travel. In addition, the backpack straps can be stored in the set-up part, so they won't get in the way during train commutes. All zippers have string-type pulls, making them easy to open and close even while wearing gloves in the winter.