I'm designing box art for a card game but I've never really designed packages before. The layout, I think, is really simple to create, but I don't know how much room to give to let the cards slide in ant out relatively easily and to have the game instructions not too tight.
the dimensions of the cards are business card size (3.5" x 2") and stacked two piles high to make the box a little thinner. So I have the front measuring 3.5"x4". I measured out the height of the two stacks to be about .78".
Is there some standard or suggested measurements when making this type of packaging and how much room to give?