Prefer to stick with soda? This might be another beverage to resist stockpiling, especially if you drink diet soft drinks. Real Simple says you only have a few months after the "best by" date before quality starts to decline.
That mega-size bottle of laundry detergent is probably a tempting buy, but hold off unless you really do a lot of laundry. Whether you prefer liquid or powder detergents, they typically only retain all of their cleaning power for six months to a year, according to Good Housekeeping. After that, they start to lose their effectiveness.
The news is even worse for dishwasher detergent: You'll only get about three months of peak effectiveness, says Good Housekeeping. If you prefer to wash your dishes by hand, you'll get a much longer detergent lifespan of up to 18 months from regular dish soap.
LIQUID AND CREAM EYE MAKEUP
Skip any multipacks of mascara and liquid eyeliners, both of which can go bad in just three months, according to Good Housekeeping. Cream eye shadows have only six months. Bulk buys are safer for powder eye shadows and pencil liners, which are good up to two years.
Notoriously pricey sunscreen can be a tempting bulk buy, but be careful to store it in a cool environment. That's because the ingredients that protect us from the sun's harmful rays can actually start to break down in the heat, which could leave you burnt even after slathering on the sunscreen.
Unless you go through a lot of bleach, buying that jumbo-size bottle probably isn't the best move. Real Simple says it's effective only up to six months. Clorox notes that the active ingredient, sodium hypochlorite, naturally breaks down, especially in extreme temperatures. Even bleach that's always kept at room temperature should be replaced after a year, the company advises.
Diapers are a risky bulk buy because babies grow so fast. A sudden growth spurt could render that massive case of Size 1s useless, while an early potty trainee might suddenly say bye-bye to a fresh case of Size 4s. Diapers may also be available elsewhere for less. For example, a recent Cheapism price comparison showed Amazon had lower prices on Huggies than Costco, and that's without accounting for additional Amazon Family discounts.
While most vitamins and dietary supplements can last quite a while -- roughly two years, according to The New York Times -- the same isn't the case for probiotics. You'll only about a year before they should be pitched, and take note of storage instructions: Some will require refrigeration.
Many skincare products have a short shelf life. The worst offenders, according to Allure: hydroquinone creams used for lightening age spots and freckles (2-3 months); peels and masks (3 months); acne treatments (4-6 months); and skin-perfecting retinoid creams (9-11 months). Also, be wary of anything sold in a jar: Dipping in repeatedly exposes the product to more air, light, and bacteria, experts tell The New York Times.
That massive bag of brown rice or quinoa may seem like a healthy, budget-friendly buy, but whole grains don't stay fresh as long as their processed counterparts. Intact whole grains will last up to six months in an air-tight container in the pantry, advises the Whole Grains Council. Whole grain flours and meals only keep up to a few months.
Price is the biggest consideration here. Cereal is one of the most popular items on supermarket shelves, which means you can snag great deals because sales are frequent, according to Clark Howard. Of course, you also need to consider freshness before buying in bulk -- no one likes stale Cheerios. And once opened, that massive box of cereal will start going stale in two or three months, according to Still Tasty.
Aside from the fact that you'll need a lot of storage space for the massive packs at toilet paper found at your local warehouse club, sometimes you won't save compared with the supermarket. Kiplinger found that Kroger was 25 percent cheaper per roll than Sam's Club on Charmin Ultra Soft. You can also use manufacturer's coupons for an even better deal at the grocery, unlike Sam's and Costco, which prohibit them.