Maelstrom hydration backpack is your go-to for hiking trails, cycling routes, and morning runs. Perfect for storing a 2L water bladder (aluminum-lined for cold retention), it keeps you hydrated on long treks. The breathable back panel prevents sweat buildup, making it ideal for mountain hikes or urban jogs—your versatile water backpack for every adventure. Product description Front Zipper Pocket Convenient for storing frequently used small items like gloves and tissues, ensuring easy access when needed. Helmet Belt Ideal for cycling, outdoor sports and more; secures helmets firmly while freeing hands for unhindered movement. Back Zipper Pocket Perfect for valuables such as mobile phones Smooth and Sturdy Zipper Pulls smoothly without jamming during use, featuring sturdy material to withstand repeated openings and closures. About this item 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, the water bladder is made of durable PEVA material (BPA-free)，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 ven