Zoners in Zuccotti Utopia.
In an earlier Praxis post, from January 2010, Flight ER Doc commented:
In theory, the medium sized packs can be used with just shoulder straps (not with a frame)....
This is a bad idea! As long ago as the mid 1980's the Army started noticing (officially) that a lot of troops were suffering nerve damage (from slow to heal, to permanent) from the pressure of the alice shoulder straps in the brachial plexus (a cluster of nerves in the shoulder). The pack without the frame and waist band will pull down and put too much pressure on these nerves, causing the damage.
Now, it apparent that these two love birds from Zuccotti Park may indeed have nerve damage, but I don't think it is from the ALICE packs.