Just pack a SS plate and don't worry about it.
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1) Stainless is more dense than aluminum, so is more negatively buoyant in the water for the same dry weight, 2) stainless won't oxidize like aluminum if the anodizing gets scratched off, 3) with all the cut outs, it looks more cool than a solid aluminum backplateI’m a little confused. Why take a stainless steel BP, cut a bunch of holes in it to make it weigh less and market it as a travel backplate? Why not just buy aluminum if you want lighter? I’m honestly perplexed by this.