Bit of an older post, but I saw no resolution so thought I would chime in.
I have this:
http://www.amazon.com/Outdoor-Products- ... s+backpack
It will fit two 17" MBP in the laptop compartment and a Push in the 'main' compartment (and a laptop in there if you really wanted it to). I don't know if two typical PC laptops will fit in the laptop compartment, likely not.
It has mesh water bottle pockets on the outside, a "boarding pass wallet" on the spine, a pocket at the lower back for your passport and other valuables, and then the "front gadget pocket" has a ton of organizational pockets. I keep my audio interface in one (an RME Babyface fits perfectly in one of the larger ones) along with two digital cameras, my headphones, some earbuds, it has a usb drive pocket I keep a dongle in, plus pockets for pens, cables, batteries... it's incredibly versatile and organized. And then you stuff a hoody into the external expanding pocket.
I love this thing.
I've had the Power Pack 2.0 for almost a year, and I had the smaller 'Glide' version for a year. The Glide looks brand new after several trips to Europe and back. The one I linked, the Power Pack 2.0, I use every single day.
May get a bit heavy carrying around two laptops and Push. That's nearly 20lbs in something with no frame. Though I've carried around that much and it's okay as long as you aren't planning to hike for several hours.
I don't 'produce.' I write music.