most of the covers that are using the corner straps are pretty similar except one corner (typically the upper right) is elastic of some sort to allow for ease of putting the cover on and off. I have actually put my ID and credit card in the cover. sometimes going into a restaurant and I don't need anything else, while flying, and maybe even a store where I anticipant any sort of delay. anything that would be big enough to handle any of the cords would be more along the lines of a sleeve than a cover I think. I'm not sure about the K3, but it is very easy to charge the K2 when it is in the cover.
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