In 10m you should be still positively buaynt for safety reasons, so 3 to 5 kg should be OK. No wetsuit or just a thin one, being slim, diving with less than full lungs - take rather less. If you dive on FRC, you'll need even less. But as I told, do not bother with bringing too many weights with you on the plane - you'll be always able to get some from any local dive shop.
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