With a deep history in bags including backpacks, sport travel bags, bike bags, and luggage, Thule is a relative newcomer to hydration packs, launching its first line of bladder-equipped packs in 2017. Today, the Swedish brand has a full line of hydration backpacks and hip bags. The Rail Backpack 18L is the highest-volume offering in the line, with a dedicated ebike battery storage pocket, removable and lightweight Koroyd back protector (the same protection tech found in some Smith bike and snow helmets), a 2.5-liter HydraPak reservoir with a magnetic hose return system, organization for tools, pumps, and snacks, a shove-it pocket for a jacket or extra layers, and a rain cover. At Cycle Volta, we just got this pack in for testing. Look for our full review in the coming weeks.