Used a few times. It's quite large capacity (details unknown). - Backrest: 27cm x 43cm - Gusset: Approximately 13cm - For travel, when you want to pack everything in one place. - For long trips or for families. - For emergencies or disasters, you can put in food and bulky items. - With a flap, it protects your luggage from rain, etc. - Made of nylon, so it's durable and long-lasting. - You can't take out the luggage from the main compartment from the side, so it's not suitable for those who frequently take things in and out. - Due to the thickness of the shoulder straps, it's not suitable for carrying heavy items.