The 2.5 litre Hydraulics LT reservoir sits securely in the internal hydration sleeve and can be easily accessed mid stride. Hydration is half the battle of staying cool; the other is ventilation. An AirScape backpanel features a central ventilation channel to let vapour escape and keep your temperature down, even during the toughest runs.The bite-valve is always within reach thanks to the innovative magnetic sternum strap, which can be opened and closed with one hand, while never taking your eyes off the trail.AirScape mesh backpanel with central ventilation channelDual mesh pockets on inner front panelExternal hydration accessFront zippered pocketInternal hydration sleeveTop scratch-free pocket - can store your sunglasses or phone without risk of damageInternal key attachment clipSternum strap buckle with magnetReflective graphicsLED light attachment pointCapacity: 3 litresDimensions: 40cm (L) x 18cm (W) x 13cm (D)Weight: 0.2kgFabric: 210D Poly Honeycomb