All-in-One Hydration Solution: Maelstrom hiking backpack with water bladder combines durable nylon construction (1.1 lbs total weight) with 4 storage pockets and an aluminum-lined bladder sleeve for leak-proof, insulated cooling—perfect for hydration backpack enthusiasts. Hands-Free Hydration System: Designed as a running hydration vest, the main compartment fits a 2L water bladder, while shoulder strap hose ports enable easy sipping during hikes or runs. Helmet Storage & Reflective Safety: External clips secure your cycling helmet, and reflective strips enhance visibility, making this water backpack ideal for men and women tackling outdoor adventures day or night. Universal Comfort Fit: Adjustable chest straps from 22.4–61 inches ensure a custom fit for all body types, labeling it a go-to hydration pack for men and women. Breathable & Versatile Design: Engineered with a ventilated back panel and hydration ports, this water backpack doubles as a hiking backpack with water bladder and running hydration vest, catering to all outdoor enthusiasts.