This 21L backpack from lululemon is designed for everyday use. It features adjustable padded straps, zippered exterior pockets, side pockets, and an exterior padded pocket that fits a 16" laptop. The bag also has interior zippered and mesh slip pockets and a zippered main compartment.
The dimensions are W 29cm x D 15cm x H 42cm (11.4" x 6" x 16.5").