If you need to carry a lot of weight you may want a hip belt, load lifters and a sternum strap to help stabilize and support the load
The main compartment is large, without feeling cavernous and the laptop slot (which fits up to a 17 macbook) holds my computer quite well
The massive side pockets hold everything from dual water bottles to a rolled-up tent, and the hip belt is nicely padded with large pockets where I can fit snacks, my phone, and a headlamp
Instead, it merely has a side grab-handlemeaning you can carry the bag in backpack mode or briefcase mode by holding it with the handle
Its easier to know whats where ;) There Are Exceptions Though
But whereas it started making around 900 frames a year, Trek now boasts an annual revenue of $1 Billion with 1800 employees