The R6 Field Pack allows for the secure and simple attachment of weatherproof accessories to the exterior of the bag. The patented ArkivA(R) modular system gives the bag freedom to evolve and adapt as needed. All Arkiv bags and accessories are completely weatherproof, made in the USA and backed by a lifetime warranty.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 16" MacBook Pro. The Arkiv backpacks feature multiple weatherproof compartments, urethane coated YKK zippers, waterproof materials, and an internal frame sheet.Equipped with 6 Arkiv rails and available in two sizes with an arsenal of accessories to choose from, the R6 series is ready to customize and travel. Accessories range from simple cell phone pouches and tool pockets to larger organizers and laptop sleeves.R6 Field Pack sold alone, accessories sold separately.