Frankly, making your own pumpkin spice is so easy. You more than likely already have the ingredients on your kitchen cabinet shelf. Another reason to make your own pumpkin spice is that you can control the flavors, increase or decrease the spice(s) you most prefer.
Here are the primary ingredients and measurements.
1-1/2 teaspoons ground cinnamon
2 teaspoons ground ginger
1 teaspoon ground nutmeg
3/4 teaspoon ground allspice
3/4 teaspoon ground cloves
Mix well all ingredients and store in a clean glass jar. Cover with a very tight lid. This will store in a dry place for about 2-3 years. It doesn’t really expire in a way that will make you sick. However, ground spices can lose their “potency”; that is, it’s flavor will not be as intense.