Mac Baren Tobacco pouch ?

[didimauw]

I bought a black Mac Baren tobacco pouch a year or two ago. Its the kind that unfolds into a little...box? My question is, what is the little rectangle area on the upper flap for?

 

[freakiefrog]

RYO cigarette papers

 

[didimauw]

That was the only thing I could think of