Holds 3x5 index cards for notes on the go. Keeps them organized and protects from bending or damage in a bag or pocket. There's a slot for a pen. It won't fit every pen but most pens with a clip will fit and clip OK.

These print without supports. The design is 2-part. Glue them together with a small amount of CA glue or similar in the channel where top mates into bottom.