nylon Made in the USA WATER BLADDER INCLUDED: This pack comes with our unique, square-shaped 1.5 Liter hydration bladder. The bladder is 100% BPA & PVC free, dishwasher safe, and doesn’t leak MADE FOR THE MOUNTAINS: Quickly go from trail running to an alpine adventure with a premium hydration vest that blends day pack and hiking back pack technology with running hydration pack speed HUGS YOUR BODY: Designed to hug your body with vest-style comfort, the multiple cinch straps allow for a dialed in fit to keep the water bladder tight and secure to your body when moving fast through rocky terrain ZERO BOUNCE OR SLOSH: The innovative pack holds your water in a way that eliminates the slap, bounce, and slosh from traditional running bags and replaces it with a smooth and balanced experience in motion with your fluids YOU’LL FORGET IT’S THERE: Since the water hydration bladder is in a more stable position, your hydration becomes less noticeable. Therefore, less of a burden; so you can focus on your adventure – and not your pack BREATHABLE AIR-MESH ON THE FRONT: Sweat wicking and breathable air mesh shoulder straps and paneling take the heat off your body, is anti-chafe, and soft to the touch WEATHERPROOF PROTECTION ON THE BACK: The back shell fabric is completely weatherproof and water resistant to keep your essentials dry and protected. Reinforced by the top lid and weatherproof zipper LIGHTNING FAST ACCESS TO YOUR GEAR: Every centimeter on the pack is optimized for thoughtful storage and lighting fast access to your valuables, accessories, and hydration STEALTHY BRANDING & DESIGN: Inspired by the stealth aircraft, this fast mountain running hydration vest flies under the radar from overly branded neon and bright-colored running and hiking gear for a minimal and speedy aesthetic VERSATILITY IS UNMATCHED: Due to the compact lower center of gravity and breathable and secure fit, it also works great as a lightweight small hiking backpack for men, a small hiking backpack for women, or a mountain bike backpack The Drankful Adventure Pack is a combination between a hiking day pack and a running backpack for men / running backpack for women. While the hydropack backpack was made for mountain activities such as being used as a running hydration pack, it is versatile enough to be an anti theft hydration backpack option to be used as a ski backpack, snowboard backpack, hiking bag, daypack, motocross hydration backpack, cycling backpack, or biking backpack. The unique water backpack for hiking design mixed with running backpack technology holds your fluids in a comfortable way, so the water pouch hydration bag stays smooth and steady during rocky scrambles and rugged trails. Our knowledge of outdoor hiking backpacks, bags, and packs have all come together to make this the ultimate adventure hydro backpack for hands-free and fast hydration access on the move, while eliminating any need for a bulky bottle. Each pack comes with a 1.5 liter hydration bladder and drinking tube. Made from lightweight 40D RipStop Nylon and Stretchy Mesh for a premium water pack for hiking, running, biking, and backpack hiking.