Two liters of water weigh two kilograms. Integrated hydration systems move that load against your back, route it to your mouth, and keep it liquid below freezing — engineering notes for hunting pack buyers, from GAF Outdoor.
How pack panniers are actually engineered — the 5% lateral balance rule, three-strap fore-aft retention, 30-second off-side quick release, 1000D Cordura builds, and what the category looks like as an OEM sourcing decision.