Rangland 4L Hydration Backpack With a true 4-liter (135 oz) capacity, this integrated hydration backpack holds significantly more than standard 2L and even “large” 3L models — giving you the water supply you need for extended time outdoors. The rugged 600D polyester backpack features a padded, ventilated back panel for comfort and breathability, plus a zippered center pocket for carrying keys, phone, wallet, or other small essentials. Built for long days on the trail, it's the ideal setup for hiking, biking, or any adventure that keeps you out from morning to evening. High Capacity Water Bladder Built from heavy-gauge PEVA with reinforced seams, the custom-fit bladder resists leaks and damage, even under tough conditions. An oversized screw cap allows for quick filling from any source (including with ice) and provides full access for cleaning. Volume markings in 0.5L increments make it easy to track your remaining supply. The quick-connect hose attaches securely and detaches with a push-button release, while an internal auto-shutoff valve prevents leaks when disconnected. A push-turn bite valve delivers smooth, controlled flow and pairs with dual S-hooks on the shoulder straps to keep the hose secure and accessible for easy one-handed hydration. Product Specs Capacity: 4L (135 ounces) integrated bladder Bladder Dimensions: 460 x 265 x 24.6 mm Backpack Dimensions: 480 x 350 x 50 mm Bladder Material: Heavy-gauge PEVA Hose Material: FDA-grade PVC One-handed valve control Quick release hose Wide-mouth fill cap Water level markings at half liter intervals Backpack: 600D polyester with padded mesh back panel Zippered center pocket