Unfortunately not, during warm days, hard working getting up a sweat then even the backpack such as the ones shown on the link become very worthwhile such as the Berghaus Freeflow light 32. (the link below shows some nice packs which take the concept even further such as with the new Berghaus FreeFlow Pro)

http://www.outdoorsmagic.com/gear-features/ventilated-packs/6328.html?print=true

The Ribz material is also quite unforgiving being a non permeable barrier layer as well, which wraps all the way around the front lower torso. If there is anything worse than a sweaty back it has to be a sweaty stomach.