The Fjallraven
Kanken backpack is a good option for travelers who don't need a large laptop compartment. It has a padded seat pad, which helps protect your back against pointy items. However, it doesn't offer many features that you might expect from a more high-end bag.
Another great feature of the Kanken is the dual layer straps. The first layer has a foam padding that provides a little extra cushion without adding too much weight.