There's the hybrid plates (Steel & Kydex) such as the DeepSeaSupply Kydex one, but it still weights 1.6 lbs Wings / Backplates / BCD's, Kydex Backplates at divingniknaks 0121 707 5783. Frog, Dirzone, Agir Brokk Scuba Diving Gear
There's also the bone shaped light-weight travel plate, but I'm not sure whether they're any lighter than 1.5 lbs. Diving Products - BC Backplate
Cheers
Andy
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