I have a Van Der Spek Brown Janet Leather Codex Weeks Cover in the basic design, and also an Undyed Janet Leather Codex Weeks Mega Cover. I have not tried putting a Mega Weeks in the standard cover, or vice versa, but there is not a big difference in size between the two. In addition, I have a gusseted pocket in the undyed, while the regular one is a basic, flat design. The undyed also has bookmarks and a broader strap than the brown one.
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