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Pointman said...Seem to remember Leech posting on here about his kite/windsurf harness / impact vest / camelbak thingo...apparently it was all of those things in one

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Sounded like the biz.
That's right, it's impact vest w/neutral buoyancy and a camelpak. It has padding in the top half only and the slim bottom half fits snug under a waist harness (would also work nicely with a seat).
I tend not to use the camel pack. I find that in waves it is just a nuisance. Plus, my back takes a caning on failed loops and I don't want to bust it.

Don't know if the vests are still available but it's the one at the bottom of this page:
http://www.sunshinecoastsailboards.com.au/accessories_Kite.htm