These bags have a zipper located on the side of the bag behind two folding flaps where your back will be when carrying the bag, instead of in the regular spot on top of the bag. This helps to prevent theft and makes it so nobody can mess around with what's inside your bag while you're wearing it. AWOL bags are made with the highest quality fabrics, hardware, and stitching in the textile industry. These high quality materials deliver an odor locking power unrivaled by any other backpack on the market. Durable, water repellant, and odor proof, AWOL will carry your harvest safely wherever you go. The bag's outer shell is made from a heavy duty specialized material giving it it's rugged feel, water repellent protection, and quality appearance. This same material is featured on many tactical bags in military gear and in high-durability luggage products. The inside of the bag features an odor capturing activated carbon lining protected by a thick nylon mesh. In addition to being larger, we have included reinforced stitching to hold the extra weight, nylon mesh to protect the carbon lining, and thicker straps and handles to prevent tearing and increase comfort. The AWOL XL Roll-UP Backpack also features additional space that can be accessed on demand by unrolling the additional fabric at the top of the pack. Once you are done using the extra space simply Roll-UP the fabric for a more compact bag. A key feature of the AWOL backpacks is the closure system; the wetsuit zipper and double flap keep the moisture out and keep in the smell. Never worry again about your stank. With AWOL bags you can take your harvest to the Bank! Dimensions: Unfolded 39" x 12" x 5" Folded 25" x 12 x 5"