I'm not keen on strapping stuff onto my bike, but I'd like to be able to carry some stuff around. Laptop (only a little 14 incher), uni books, lunch and assorted crap mean it needs to be fairly roomy, but not bulky. Preferably looking for the following features: - Laptop sleeve - Helmet carrying abilities (for the occasional pillion) - Roomy - Straps across the front (to stop it sliding around) - Vented down the back, to stop things getting too sweaty - Looks hot! Not sure if these are all possible, but would be nice. Something like this, mebbe? What works for you?