Worst: Jerky
Beef jerky, as tasty as it may be, just doesn’t last very long. The salt and spices it has does not act so well at preserving the meat. If you do purchase this, you should probably keep it in the fridge after it is opened. Even on the packages it says that once opened it must be consumed within 3 days. Even in the refrigerator it will only last a week or so. For this reason, buying in bulk from Costco probably isn’t the way to go.
Worst: Hummus
Hummus is great, but why on earth (unless you have a restaurant or were throwing a party) would you ever need this amount of hummus. Simply purchase a smaller container from a normal store and it will avoid food going to waste.