The Arrow 3 is a lightweight hydration pack that is perfect for racing and events. It holds 2 x 500ml flexi flasks to carry a 1 litre of fluids. Designed in a race vest style it is easily adjustable . Once adjusted it hugs the body making it comfortable over the longer distances. The main compartment has space to add an additional 1.5 litre bladder. Perfect for Trail Marathons and 50k Mountain Races.