Nearly all Treuleben products, whether these are calendars, journals or leather goods, feature the original Treuleben envelope
design. For products in book format, the material for the dark blue card stock envelope pocket is produced by the traditional paper manufacturer Fedrigoni.
line of leather goods, he envelope pocket is crafted in full-grain cowhide leather. The patented design is reminiscent of an open postal envelope, but is
two-pocket construction: The top pocket can be used to quickly stow notes, tickets or receipts. The bottom pocket protects these items from falling out;
safe for the next time you need them.