The Advanced Projects Edition VX / R8 Field Pack allows for the secure and simple attachment of weatherproof accessories to the exterior of the bag. The patented Arkiv® modular system gives the bag freedom to evolve and adapt as needed. With an arsenal of accessories to choose from the R8 series is ready to travel. Accessories range from simple cell phone pouches and tool pockets to larger organizers and laptop sleeves. Equipped with 8 Arkiv rails and available in two sizes. The AP Edition is made with a 1000 denier VX Cordura ripstop shell backed with a PTFE waterproof membrane. In addition, the R8 is lined with a lightweight VX70 ripstop liner. All of which results in an exceptionally durable barrier to the elements. The pack can be used in either "roll-top" mode, or in a traditional "flap-down" configuration, has one external zippered pocket for items like a phone or passport, and one interior zippered pocket that is ideal for documents and fits up to a 15'' laptop. The Arkiv backpacks feature multiple weatherproof compartments, urethane coated YKK zippers, waterproof materials, and an internal frame sheet. All Arkiv bags and accessories are completely weatherproof, made in the USA and backed by a lifetime warranty.