We’ve been moving gradually towards this for a few years. We traveled to Tokyo in 2009 with a backpack each, and moved from Guam to San Francisco in 2010 with a backpack each, then took a month trip with a backpack each. In those cases, the backpacks were usually filled with clothes and computers and various gadgets and toys.
If you think my pack was tiny, check out the 7-item content of Leo’s backpack, which amazingly, extends to his entire family.