This Crossbody Bag with Nano Pouch 2L is a popular pick on Lululemon. It has a ton of spots for storage and has been dubbed the "perfect go-to bag" by shoppers.
But not all backpacks are suitable for work. Obviously, at a bare minimum, it has to be big enough to fit a laptop, lunch ... grab my phone or keys, and the dual elasticated 1-litre bottle ...