I'm currently carrying a 3 KG bruce anchor (galvanized Chinese knockoff, actually) + 2 m of chain. I haven't used it yet, but I'm sure it will be quite adequate. I had been using a 5 KG bruce anchor during the last couple of summers and felt it was way more than necessary. It certainly held with no slippage in every condition I tried it in. I decided to go with a smaller anchor this summer since it was able to fit in my bow storage box much more neatly than the other one did.
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