A self-storage unit is useful for many reasons. No matter why you decide to use a storage unit, you'll need to prepare your belongings and pack them securely before stowing them away. There are different ways to pack your things—and some containers are better than others. Here's a look at four options, and the pros and cons of each. 1. Use Plastic or Cotton Bags Plastic bags are cheap and convenient to use for storage, but they aren't ideal.