40% lower profile physics, times two! The endurance enthusiasts dream double pack with the sleek bounce-free low profile performance of Amphipod's technology now with a full 40+ ounces. Includes dual easy-access 20 oz. low-profile Hydraform™ bottles. Ample space for fuel and gear with an extra-large cargo area, zippered quick-access pocket and compression bungee for jacket, gloves and hat.

• A Full 40+ ounces with 2 x 20-ounce Hydraform Bottles
• Expandable stretch-mesh, with 2 extra large zipper pockets
• Compression bungee for jacket, gloves and lots more
• Fully-adjustable, comfort waist belt.
• Cool and vented AirFlow Mesh™ back panel
• 40% lower profile to minimize bounce and slosh
• Ergonomically sculpted to hug the lumbar
• Designed for easy retrieval and replacement of bottle