The Futura top-loading daypacks are lightweight trekking style packs with a mesh back to keep you cool.  They have lots of outside pockets, zippered bottom compartment, a padded hip belt with pockets, hiking pole attachment loops, rain cover, and hydration system compatibility. 

Weight: 1440 g
Volume: 32 litres
Size: 65 x 30 x 20 cm

Deuter Aircomfort System:  With a taut mesh back supported by a flexible spring steel frame this system has been tested as the most ventilated harness you can get on the market.