Constructed from 840-denier, abrasion- and puncture-resistant ballistic nylon then coated with .1mm TPU on both sides of the fabric, we've yet to see a more waterproof and thoroughly seam-sealed pack collection on the planet. 30 waterproof liters of storage gives you ample daypack capability and then some. With a slightly longer back panel, we've even rethought the way a pack capable of holding so much gear sits on your hips, yet wears like it's hardly even behind you. Our answer came in the form of a wider, lumbar strap/buckle with larger, pocketed wings. Both fit and feel just right without constricting movement. Also note the beefy, submersible, easy-slide, #10 TIZIP(R) MasterSeal zipper, as that one's critical. With actual teeth that grab and seal, it prevents the dreaded blowout that plagues packs with a sandwich bag-style, toothless zipper. Gear stays bone dry and access is easy thanks to a generous opening with an interior we've brightened up by adding a high-vis chartreuse color. We've also redesigned the shoulder straps and back panel with perforated 10mm foam padding, decreasing weight and bulk while allowing for better air circulation. In short, the days of the dreaded 'misty back' are over. Deep dive into further features and you'll find an integrated back panel net scabbard and exterior D-ring, rod-tube cam straps, water bottle pocket with retention leash, and internal hanging pockets to keep gear organized. The shoulder straps even give you accessory docking stations and a unique buckle that lets you customize even more by adding our 3L Chest Pack and 2L Chest/Hip Pack, making the PRO Waterproof Backpack the day pack to end all day packs. 30L/1830 cu. in. In cloudburst. ImportedFeatures Include:Made from 840-denier, abrasion- and puncture-resistant ballistic nylonCoated with .1mm waterproof TPU on both sidesSlightly longer back panel repositions lumbar straps better across hips for weight distributionSubmersible, blow-out free, #10 TIZIP(R) MasterSeal zipperGenerous opening dimensions for easy accessPerforated, 10mm foam padding shoulder straps and back panelIntegrated back panel net scabbard and exterior D-ringRod tube cam straps