Measurements are 
Small - 35 x 27.5 x 15cm Capacity 12 Litres
Large - 45 x 31 x 16cm Capacity 20 Litres
- Fully lined 
- Zipped main compartment
- Internal slip pocket. Zipped front pocket
- Rear zipped pocket
- Side pockets
- Padded back panel
- Padded adjustable shoulder straps
- Grab handle