The Go packable backpack from Aer definitely provides more than most packable backpacks.
Other Bags to Check Out:
The Daily backpack from Able Carry is an affordable, sleek little bag for daily carry.
A very innovative backpack for either large daily carry or serious travelers who need one bag for both travel and daily carry. This is a winner for me in the medium size 1-bag travel category.
The Guide Pack from Tom Bihn is a bag geek's boner pill. It's classic design and exceedingly excellent manufacturing make it more like an heirloom than a bag. But this bag also performs great as a travel bag!
This bag from Filson is easily one of my favorite briefcase-type bags due to it's excellent materials, organization, and classic aesthetic.
The Dashpack Mark II from Arktype has lots of small organization and some very modern styling in a tight, sleek 15L daily carry.