You know those tiny little bags of screws and bits you get with Ikea furniture and computer components? Don’t struggle to pull them apart, just squeeze and slide!
The cheap re-sealable “Ziploc” bags that come already filled are often made out of very thin plastic and the seal can be stronger than the material to which it’s attached. I’ve found that the easiest way to open these little bags is to slide the two tracks against each other and the bag will pop open at the corners. In most cases you can even open the baggies one handed, keeping the other hand free to pat yourself on the back (something I find necessary since my wife is rarely as impressed with me as I am with myself).