Camera layout in the 15L Zip
Place the camera and the accessories you use most often in the proposed divider layout. Check the largest item's dimensions against the opening and interior space. If your kit changes substantially between outings, investigate how easily the dividers can be rearranged and whether the smaller volume still supports those alternate arrangements.
When the 20L Zip offers useful room
A compact equipment bag still needs to accommodate the personal items that accompany you. Add the laptop case, keys and any food or layer to the fit check rather than treating them as afterthoughts. Compare the 20L Zip if the practical load requires squeezing everything around a camera layout that already occupies the interior.
