The search for the perfect day bag

Over the last few weeks my consumerist attentions have gone off a number of different directions but the one constant longing has been that of a day bag. I have a number of different bags in my possession but the bulk of them fall in the weekend bag category and are deemed too large for everyday use. I am on the lookout for the perfect, universal everyday bag. Something that allows me enough storage space for my Poloaroid camera, a magazine (I have to carry a magazine at all times), a good book (I really have to get back into the habit of reading literature), my notebook, pen and possibly essential toiletries. I have fallen in love with the below bag from Topman Design but I fear it might fall into weekend bag territory.

I might need some help on this one...If I had the money I would invest it wisely in a bag by Jas M.B. like this one but unfortunately New York has robbed me. A little shopping trip lies in store for me this weekend, I have to put an end to this quest and hopefully a store like Hurwendeki can help.