Double-sided Zipper Pack / Zipper Bag

Most seeds come from fruits that naturally free themselves from the shell, nuts such as pistachio, peanut, and walnut which have hard shell walls. Customers buy nuts from the market usually packed in retail sealed bag. Nuts have to be peeled from the hard shell when eating. Here comes the problem, where should these hard shell discarded in the most convenience way? Double-sided zipper pack design is the best solution to solve it.