A leather square bag pack that has a simple appearance and is suitable for both business and casual. The outer material is made of cowhide and has a water-repellent finish (easy to repel water). The inner fabric is made of Polygiene's ViralOff treated fabric and has a water-repellent finish (easy to repel water). There are many pockets on the inside, and some of them are made of mesh fabric that makes it easy to see what you put in. It comes with a bottle holder that does not easily fall over inside my bottle or folding umbrella. The main can store A4 documents and a 13.3-inch laptop. There is also an outer pocket on the back, which can store documents and computers. Small items that are often put in and taken out can be handled in the outer pocket. The shoulder belt uses a thick core material to make it gentle around the shoulders.