We've covered tons of bags over the years, but nearly all of them suffer from the same issue: their designs are static, and can't adapt to your specific needs. The Mission Workshop Arkiv Field Pack ($210 and up) can. Thanks to the unique Arkiv system that lets you easily attach mission-specific pouches to the outside of the bag, the waterproof, mil-spec Field Pack offers ample storage for anything you might need, while letting you cut extra weight by removing the pouches meant for items you don't. Made in the USA and available in two sizes with black, dark gray, or waxed canvas exteriors.
Carry everything you need for the day without needlessly weighing yourself down with the Hammarhead Industries Day Pack ($290). Crafted from waterproof waxed cotton, black leather, and parachute hardware, the Pack features a rolltop closure, interior compartments for a laptop, iPad, and Kindle, and an industrial style that'll look great perched atop your two-wheeled monster. [Scouted by Andrew]