The higher capacity Slipstream + has evolved directly from the new Slipstream concept. We have added some back length and depth to the bag to achieve around six litres extra capacity. The other big difference is that this 'Plus' model has direct side zip access into the laptop compartment, a very convenient feature at airport security checks. All else is identical to the Slipstream: the inward facing main zip and sloping top panel give this bag the best possible water-shedding, weather-resistance. Immediately you start using this pack you will discover its convenience: Push back the unzipped bag canopy and the entire contents can be easily viewed and accessed. Selecting from the contents is a breeze. With more than 25 litres usable capacity this rugged day pack is ideal for not just about every trans-urban, work-day journey but for world travel as well.