Safe & Eco-Friendly: Made from 100% BPA and PVC-free materials for safe hydration. No harmful chemicals, just clean, worry-free water wherever your adventures take you. Ultra-Soft & Flexible Design: Crafted with premium soft material that conforms to any pocket or vest. Folds flat when empty—perfect for runners, hikers, and minimal packers. Customizable Hydration: Use with or without the included tube. Easily attach the bite valve directly to the cap for quick sips or mount the tube for hands-free hydration. Fast-Flow 42mm Sport Cap: Features a wide-mouth 42mm cap with a soft silicone bite valve for smooth, easy sipping—even during intense movement or long-distance runs. Built to Last with No-Leak Guarantee: Engineered for durability and rugged use. Trusted by endurance athletes and backed by Orange Mud’s No-Leak Guarantee for peace of mind. The Orange Mud UltraFlask 500 soft flask is an ideal compliment to the Endurance Pack, HydraQuiver Vest Packs, Gear Vest, Adventure Pack and PFV series of Orange Mud products. You can quickly stash the flask in your front chest pocket for access on the fly plus it comes with an optional use 4" hose. Quickly take it off if you just want the bite valve, or if you want the hose leave it as is!