The Ortlieb Rack-Pack 31L won't let you down when it's howling with hurricane forces or pouring rain at biblical rates outside, thanks to its ruggedized construction that's highly impervious to outside moisture and abrasion-resistant. This 31-liter version is the mid-sized option in the Rack-Pack line, providing enough storage for multi-day trips and extensive outdoor adventures on the weekends. Fully waterproof materials are highly resistant to abrasion, rips, and tears, meaning it'll withstand the rigors of everything from cross-country road trips atop your vehicle to rough ocean swells in the back of your kayak. The roll-top design is fortified with a stiffener bar to ensure a rigid platform that won't allow moisture ingress, even when it's pouring at prolific rates outside. Additionally, you'll find a reinforced grab handles for loading convenience, as well as a padded shoulder sling for comfortably carrying it across bustling airports and lengthy streets.