I have used a TrueNorth Firefly for my IA pack for a few years and it is a well build back (just didn't suit my needs).

A lot of companies have been coming out with designs similar to the TN AeroVest in the past year for USAR work, but the TrueNorth design is by far the most affordible. (Yes, that means I have one on order grin)
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"Trust in God --and press-check. You cannot ignore danger and call it faith." -Duke