In that daily deal offer thing they're running, Firebox have this iBlaze iPod control backpack.
Lists the 'TSP' at £69.99 (typical selling price?). Was sceptical but did a quick Google shopping search and cheapest on there was about £60 plus shipping.
So if you want one of these (note- doesn't work with all ipods! see below), looks like a good deal.
* Compatible with all iPods, except iTouch 2nd generation, Nano 4th generation and iPod shuffle
* Not compatible with iPhone
* Removeable padded notebook compartment compatible with up to 17' PowerBook
* Waterproof silicon control panel in shoulder strap
* Integrated retractable earphones in shoulder strap (replaceable)
* EVA thermal pressed pocket for iPod
* Spacious main compartment expandable to two A4 ring binders with additional two pockets
* Two front pockets
* Extension zipper
* Waist strap
* Foamed airflow back for comfort and ventilation
* Foamed shoulder straps
* 46cm x31cm x 23cm
* Volume is 27 litres and expanded 33 litres