Just got my Medium Backpack from Freight, and it is quite excellent. It's incredibly comfortable and holds a vast amount. I haven't used it enough to be a complete expert, so perhaps other owners can chime in with their experiences. Here are some pics.
The back is nicely padded and the waist/chest straps are awesome. Check out the extra-wide waist strap, it's pretty amazing.
Huge inside
First outside pocket.
Second and third outside pockets.
Side pocket (one on both sides).
Flap pocket.
I have insufficient beverages or adorable kittens, so I just filled it up with records. I put in 56 seam to seam (although you could probably cram in another ten). Also, some of the albums were double LPs, so adjust accordingly. This only fills it up horizontally, there's still an inch or two in the bag and even more if you use the straps.
On my back. I'm about 5'11" and the bag is filled with the aforementioned records. It's pretty heavy but sits comfortably.