Eurohike Switch Daysack (save £10) £14.99 at Millets
The Switch is a versatile 25 litre pack. During the week you can use it for work or college; then at weekends it's great for a day's walking or for travel use. The spacious main compartment has a dual zip and an internal organiser. Weight 750g.
Instore - also online but £2.95 postage