#1
Many business cards are just slightly larger than standard credit cards. This usually results in business cards getting bunny eared. The Micro sleeve keeps them safe, slim, and yet provides a nice ritual (with the pull-tab) on handing them over.
#2
Used as a tiny wallet for very organised people, the Micro Sleeve is almost as slim as you can get. Bills can be kept in one of the external pockets, with the bulk of your cards stashed safely inside.
#3
The Micro Sleeve is a favorite for people running a two wallet strategy, with infrequently used cards stored in their bag, and just their regularly used cards carried in a Micro Sleeve on their person.