• Sweatproof strap on 500ml flask adjusts to fit a wide variety of hand sizes while running.
• Flask is versatile for both left and right handed use with padded thumb loop for no-slip grip.
• 2 pack of soft silicone replacement bite valve sheaths fit all HydraPak reservoirs and flasks.
• Replacement sheaths made of durable silicone provide a soft bite.
• Flask holds 500ml of water and shrinks as you drink for reduced sloshing and easy storage.