Just noticed this while looking for some other rucksacks.
Looks like a good deal.
"Designed for urban adventure travel and European inter-railing the Departure packs offer a novel solution to the problem of carrying both a day sack and main pack. In this unique design, instead of attaching the daypack to the outside of the travel pack, it zips to the back panel and becomes the larger packs suspension system. This detachable daypack is large enough to carry all your daily requirements in its multi-pocketed design; it even has space for a laptop. The main compartment features the straightJacket sidewalls for a protected, stable load and several internal pockets for organising your clothes, toiletries etc. Top and side handles plus a removable padded shoulder strap complete the carrying options. Women's specific back system available in two sizes.
* Volume: 60 Litres in Total
* Weight: 3.24kg (Small), 3.30kg (Medium)
* Complete with removable 25 litre daypack"