To make locating an item or future unpacking even simpler, you should be sure to try to keep the contents of each box somewhat similar so that you can write a simple label, such as "Kitchen Supplies", on several surfaces on the outside of each box. You will want to write the simple label on several surfaces of the cardboard box so that it is easier to read without the need to move all of the boxes around to see the labels.
Some people suggest making an individual inventory list that is placed in each cardboard box right before it is sealed as well as a master inventory list that contains the labels and contents for every one of the boxes that is goes into the storage unit. The master list should be kept in a safe place, such as a file cabinet, with other the important papers in your residence. It allows you to know what items you have in storage without actually going there to look. In addition, it can come in handy if you choose to send someone else to the storage facility to retrieve something for you. You can tell them exactly what box they should open to find the item that you want.