Small/Medium Size: 16 - 20 inches / 41 - 51 cm :: Women > Backpacks. Capacity: 20 litresZippered panel accessStretch mesh side pockets and side compression strapsSternum strap with integrated safety whistleTwo zipped hipbelt pockets and stretch pocket to shoulder harness for quick accessBioStretch™ hipbelt and harness for extra support and comfort whilst carryingExternal hydration accessStretch front pocketAirscape™ back panel with foam ridges for ventilation and comfortLidlock™ bike helmet attachmentLED bike light attachment pointConveniently store trekking poles without the need to remove your pack with the Stow-on-the-GO™ attachmentWeight: 0.70kgWomen's backpack with adjustable torso length is specifically designed to provide an optimum fit for the female bodyReflective graphics ensure you are seen in low light Size: one size.