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I really like the one from M-Edge. It zips but allows access to the charging port. I slip my thin reading light in the zipper pocket. I am glad you advised about compression issues with carrying the charger with the Kindle. I usually put the charger in another small zipper bag with my iPod charger for when I am on the go. On a daily basis I set up a charging station in the classroom and one at home.
I will be more watchful of the compression issue with loading down my backpack when I am out on an adventure. Hope this helps. dlh