Orivs'durable PRO Waterproof Backpack 30L, is constructed from 840-denier, abrasion- and puncture-resistant ballistic nylon, and then coated with .1mm TPU on both sides of the fabric. They've yet to see a more waterproof and thoroughly seam-sealed pack collection on the planet. Thirty waterproof liters of storage give you ample day pack capability and then some. With a slightly longer back panel, they'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. Their 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 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 closure. Gear stays bone dry and access is easy thanks to a generous opening with an interior they'v...