This sacoche is made of lightweight and highly durable X-PAC material and can fit A5 size. The bottom has a gusset, making it even easier to use. It features a Jet Glide system that allows the strap to extend and contract with a tab, making it easy to pull it in and out of your body. It can also be used as a sub-bag by removing the strap and connecting it to the shoulder harness of a backpack