34 Things You Shouldn’t Buy at Sam’s Club, Costco, and BJ’s

Baking Powder and Dry Yeast

Anyone who’s ended up with flat bread, cookies, or pastry by accident knows the shelf life of baking ingredients is finite. The USDA gives baking powder and dry yeast six months at best after it’s open, which doesn’t make for great bulk purchases unless making giant batches at a time.