I’m all about minimalist bags; paring down my kit to the bare essentials so I’m not bogged down when traipsing from place to place is a daily goal of mine. I’ve gone minimal with my wallet, my MacBook and the various digital and analog ephemera I need to carry with me as I go about daily tasks for work and at home.
There is a time, however, when you need to have a larger subset of your general kit. You might need that extra battery pack (or two), your MacBook Pro, both your iPads, a couple of backup hard drives, an external keyboard, a gaming mouse, a PlayStation Vita, headphones and (of course) all the associated wires and plugins that these items require. Oh, and maybe a water bottle, a wallet, an iPhone and a set of keys.
That’s the exact stuff I’ve got packed into an STM Quantum Messenger bag — and it fits handily, with room to spare.