Will just take a 15" laptop in its slot. Straps fully adjustable to quite a large size. Main compartment zips wide open allowing easy access and it can carry everything for a busy day including lunch box and shoes. Magnetic top clasp is fiddly to open (frustrating) Side pockets are only mesh, don't close and not useful for biking. OK when off bike for bottles etc. Front zip pocket very thin. Will only take a phone etc. Won't stand on its own and falls forward annoyingly when trying to load your laptop. Main zip is sticky when closing around the top. Overall a good bag though and would recommend at this price point.