Tis the season, to pack up last season's clothes. Start early, finish early.
Start packing early. Spread out the packing process over a few weeks, or even months, to give you space and time to organize. For instance, if it’s summer, move your winter clothes into your storage unit ahead of time since they won’t be needed right away. You can even create a calendar with deadlines for rooms to be completely packed. This will ensure the actual moving day goes smoothly.