Self Storage Units
The size of unit you need depends on both how much you want to store and how tightly you want to pack the goods. It is a good idea to use similar sized sturdy boxes, which can easily be stacked and to fill large objects such as wardrobes and chests with smaller items.
Should your requirements change, most self storage units providers will be able to offer extra units or you can move to a larger or smaller unit.
Your best source of advice is a self storage unit provider. Take some time to research a few for their views on the space you need and you’ll make sure that you’re getting the best and most accurate advice. It’s in their best interests to make sure that you rent self storage units that suits you, both in the short and long-term. The majority of self storage unit providers are extremely experienced at assessing what will fit into each space and will be able to factor in any extra issues such as space needed for aisles and other general access.
Most self storage units providers have systems in place that will help you decide for yourself how much space to take. These calculators or estimators can be found on the majority of self storage unit web sites. Others will describe their units in terms that will help you visualize how much space you need. For example, Unit A will hold the contents of an average sized closet, Unit B is the size of a standard single garage. As an additional measure you can always visit a facility and look at potential unit sizes so that you can get a clearer idea of which one will suit your space needs. Again, talk to self storage units facility representatives if you’re unsure which size to opt for.

Inside Self Storage
Inside self storage is an excellent website totally devoted to the self storage industry. With many related links to storage and very thorough archive sections.