Check out this pack:

http://www.dndindustries.com/UKpatrolpack.html

I got these people to make this actual pack for me (yes, the one in the pictures). Its a plain sand coloured version of the UK Patrol Pack. Its pricey I suppose, but the quality is great and the zip off side pockets addd flexibility. It was also designed not to look overly military.
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In the end, all you have left is style...