Take a static free bag that your hard drive or other goodies come in that is in good shape
Rip out enough old useless chips like the ones shown here to fill the bag l Tip, surface mount chips can be cut of with an exacto knife but PLEASE be careful. Otherwise you can always unsolder them.
Decorate your bag so it looks like something you might buy in a store. the more authentic it looks the better. You can buy real bags of chips and cutout parts to paste them onto yours or you can print on stick-able glossy paper and simply cut out use that. The glossy paper is probably your best bet as you can do exactly what you want.
Once done place your chips inside and seal it up so it look authentic.
Another option is to buy a real bag of chips and redo it like this one.