the minimum you need,
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This review is from: Black Drawstring Velvet Sleeve Bag Case for 7" Android Tablet PC MID Kindle Fire (Electronics)
Just a piece of velvet fabric, just the correct size (could be a little longer to cover fully the last edge), thanks to the 2 pearls on the string it does not open itself in your bag. It is light and effective to protect the nexus 7 from dust and scratches only.