If you want to keep your weed fresh and potent, you should avoid storing it in a ziploc bag. Ziploc bags are not airtight and can let moisture and oxygen in, which can degrade the quality of your weed over time. A better option is to use a glass jar with a tight lid, or a vacuum-sealed container. This way, you can preserve the flavor, aroma, and potency of your weed for longer. Weed stored in a proper container can last for months or even years, depending on the conditions. However, if you smoke weed that has been stored in a ziploc bag for too long, you may notice that it has lost some of its effects and taste. Smoking old weed is not harmful, but it may not give you the same experience as fresh weed.