Odyssey's new Ballistic Pack system has the tensioning system built into the pack, not the belt, greatly improving comfort.
It incorporates features designed by the medical industry.
Ultra lightweight, super comfortable, lumbar support and it is vented to breath.
Belts are available small through extra large.
Packs are available as a 2+2, 3+3, 4+4, with more coming.
The Odyssey 4+3 Pack is older, so while it may be available used and in a few cases new, it is not commonly available anymore.
3 extra loops have Velcro so they fold on themselves to stay low profile
Found on ebay, paid a little less than $30 including the belt. This is my first vertical style pack to wear. The pods are easy to get to. The pull tabs are tapered to a point instead of squared off. Seems to be very well constructed. The plus 3 pod loops are very tight, its hard right now to put them in when the pack is off, obviously thats a good thing as I don't want them falling out as I am running. The 3 loops fold in between the 4 main pockets to be concealed to give a real sleek look when not used, using a small piece of velcro to accomplish this.