Convoy is a bag-system designed to facilitate easy and comfortable travel while keeping your belongings safe from theft. It is made of 1000 Denier CORDURA, Anefil bonded nylon thread, and mil spec stainless steel snaps for an incredibly long-lasting and durable bag. I used the bag system for a month while traveling through Israel and Spain, and I was very happy with their performance. I spent a day climbing along the costal cliffs of Calella dragging the daypack over the rough granite. It took it like a champ and didn't show a mark.