Hello I have a EM-1 and want myself a bag. First I looked for a backpack, that I could carry both my EM-1 my lunchbox and my laptop in, but I am giving up. Now I am considering a Retro 5 or 7 from ThinkTank. My most important requirement is that the EM-1 with the 12MM (Olympus F2) with hood on fits? I will also bring my 17mm and my 45 mm. Also, is it possible to put this bag inside a backpack when going to school?