Description: Many people store their marijuana in plastic bags. However, it is not a good idea for you to install cannabis in a plastic bag. Storing your cannabis in plastic will reduce the quality of it. You will be able to preserve your marijuana by storing it in a jar. If cannabis is exposed to heat, then it will quickly dry out. It will also be harsher on your lungs when you smoke it. Cold temperatures also affect the potency of the marijuana. Additionally, too much humidity can also harm the marijuana.