Stockpile: a reserve supply of something essential accumulated within a country for use during a shortage – Merriam-Webster
When couponers refer to stockpiling, they generally mean a big enough supply of something to last at least until the next sale, bought at a low price. There are significant benefits to building up a stockpile:
Saving money – Because you buy stockpile items when prices are low (usually combining a sale and coupon), you have them on hand when you need them and don’t have to pay a higher price. Stockpile enough items this way and you can save hundreds, if not thousands, of dollars.
Less stress – Because you have items on hand when you need them, you don’t have to rush out when you’re short on time and cash.
Emergency preparation – Living in earthquake country, we always have an emergency kit ready, but I also like knowing that I have lots of things on hand that would be handy in an emergency, like breakfast cereal, crackers and batteries.
Real life example: A couple of years ago, my oldest son was hospitalized and I didn’t shop for a while. But I was able to draw on my stockpile for portable snacks to take to the hospital, and I didn’t have to worry about running out of basics like toilet paper and tissue when we got home. That meant I could focus all of my energy on taking care of my son and family.