Can a super kingsize duvet cover it into a 6kg washing machine OK? I've only ever had 8kg machines and whilst I don't have loads of washing (just two of us) I want to make sure I can do the linen OK. Benefit of the 6kg is that it's slimmer so I can shove it in a cupboard. If anyone has had a 6kg and regretted it, be good to hear. TIA