Quote:
Originally Posted by kyôdai
The numbers refer to the official Kobo sleepcovers from Kobo. (I thought this was obvious). There is usually only one of them per model, in different colors...
Third party covers might have other weights, yes.
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Seemed obvious to me as well. I also doubt that the official covers vary in weight when more than one style is available for a device, I think the Libra 2 has a non origami cover and of course the origami cover.