This is the slim king of hydration backpacks that carries a big tanker of hydration for the extreme races. The Outlander 4L is geared-up with a 3.0 liter Elite hydration bladder with a Slide-Seal top for easier filling. The pack is designed with our award winning NDM 4-point harness system that almost glues the pack on your back and makes it 100% bounce free in action. You’ll get access to your phone, your credit card and some energy bars inside the external media pocket.