Van der Spek created a new cover called CODEX 🙂

You can find them here
Also available with custom the outside and inside leather and stitching!

A5:
Size: 228 x 160 x 25 mm ( and flat size 228 x 345mm )
Left hand side: 2 full height slip pockets | 5 horizontal creditcard pockets | 1 small bottom pocket. Right hand side: 2 full height slip pockets.
Van der Spek A5 CODEX size is compatible with Hobonichi Cousin planners and other A5 size notebooks (210 x 148mm)

A6:
Size: 165 x 110 x 25mm ( and flat size 165 x 242mm )
Left hand side: 1 full height slip pocket | 3 vertical creditcard pockets | 2 horizontal slip pockets. Right hand side: 1 full height slip pocket | 1 horizontal slip pocket.
Van der Spek A6 CODEX size is compatible with Hobonichi Techo planners ( 105 x 148mm )