I’ve been struggling with this and would be grateful for any pointers. I’m looking for a backpack that looks sleek enough to use at work, is nylon rather than leather, can fit a Mac Air in (cliche that I am) AND has a zipped pocket where the straps are to defeat pick pockets. Bonus points if it’s cheap(ish) and isn’t by a well-known brand… thank you if you’ve managed to get to the end of this list of sartorial demands…