Our verdict
The bigger brother to the 20L R6 uses the same amazing ARKIV system and hard wearing waterproof design with just more capacity. Maybe you're going for a long weekend rather than a quick stopover, in which case; you're sorted.
It's worth noting that many of the product images picture the standard bag with Arkiv attachments already on the bag. If you put a bag to order, you won't get any Arkiv accessories unless purchased at the same time separately.
Mission Workshop say
R6 Arkiv Field Pack:
The R6 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 R6 series is ready to travel. Accessories range from simple cell phone pouches and tool pockets to larger organizers and laptop sleeves. Equipped with 6 Arkiv rails and available in two sizes.
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.