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I guess if you can get a lightweight case and are going somewhere hot 15kg is not too bad. One of the problems if you are a family of 4 is that you seem to have to upgrade all four allowances, which makes it costly. It's a pity they wont let you just do two. I suppose that would be too difficult (and probably expensive) for them to administer and that's why it is all or nothing.
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Doe