Storage unit packing planner
This planner turns a list of belongings into a loading order for a storage unit. It assigns every item to a zone — back wall, middle tiers, front for access, or fragile on top — and produces a printable plan, so the things you will need again do not end up sealed behind the things you will not.
- 4 loading zones
- Printable plan
- No sign-up, nothing stored
1. What is going in?
The four zones
| Zone | What goes there | Why |
|---|---|---|
| Back of the unit | Heaviest items and anything you will not need until the day you empty it. | Whatever goes here is sealed in behind everything else. Put the mistakes you cannot afford to repeat — appliances, workbenches, gym equipment — where they only get moved once. |
| Middle | Large furniture and the bulk of your boxes, built up in tiers. | This is where the unit earns its capacity. Heavy boxes form the base of each tier at waist height or below; lighter ones stack above them to the ceiling. |
| Front, nearest the door | Seasonal items, tools, documents — anything you may come back for. | If you will open this unit more than once, the front third is the only part you can realistically reach. Label these boxes facing outward. |
| On top, loaded last | Fragile and light items, never underneath anything. | Dish barrels, artwork, mirrors, screens and lamps carry no weight. They go on last and come off first. |
Worked example: a three-bedroom house into a 10x20
A three-bedroom inventory runs to about 1,168 cu ft and 7,060 lb, going into a 10×20 with 1,360 cu ft usable at moderate packing.
- Back wall. Refrigerator, washer, dryer and the workbench — 680 lb of items that should be moved exactly once.
- Middle. Beds on edge, sofa on end, dressers and bookcases as tier bases, then the boxes stacked heavy-low to the ceiling. This zone carries most of the 1,168 cu ft.
- Front third. Garden tools, the grill, patio furniture and anything seasonal — the items a three-bedroom household reliably comes back for before the rental ends.
- On top, last. Dish barrels, mirrors and screens, carrying nothing above them.
With a center aisle the same unit keeps 1,156 cu ft, which this inventory still clears — so access costs nothing here except discipline about what goes in the front third.
What each layout leaves you
The aisle is not a preference, it is a capacity decision with a number attached:
| Layout | Capacity kept | In a 10×10 | In a 10×20 | Access |
|---|---|---|---|---|
| Full fill | 100% | 680 cu ft | 1,360 cu ft | None until you empty it |
| Center aisle | 85% | 578 cu ft | 1,156 cu ft | Everything reachable from one walkway |
| U-shape | 65% | 442 cu ft | 884 cu ft | Excellent — three sides reachable |
Figures are computed from the published capacity model, and the item volumes the planner totals come from the furniture dimension dataset.
Loading order
- Protect the floor. Pallets or plastic sheeting across the whole floor. Concrete sweats, and anything resting directly on it wicks moisture.
- Decide the aisle before you start. If you will need access, mark a walkway down the center now. Trying to carve one out later means unloading half the unit.
- Base layer against the back wall. Heaviest appliances and equipment first, on the floor, standing where they will not need to move again.
- Build the structure. Large furniture next. Sofas on end where the shape allows, mattresses upright against a wall, tables with the legs removed.
- Tier the boxes. Heavy boxes at the bottom of each tier, lighter ones above, stacking to the ceiling. Uniform box sizes stack far better than mixed ones.
- Fill the hollows. Drawers, appliance interiors, the inside of a wardrobe box. Empty space you paid for is space you can use.
- Front third last. Seasonal gear, tools and anything you may retrieve, labeled facing the door.
- Fragile on top. Dish barrels, artwork, screens and lamps go on last, with nothing above them.
The order matters more than the effort. A unit loaded in this sequence holds roughly 30% more than one loaded in the order things came off the truck — often the difference between a 10x10 and a 10x15, which is $35–$60 a month.
The aisle decision
This is the choice that decides whether a storage unit is usable or merely full. A center aisle costs about 15% of your capacity — in a 10x10 that is 102 cubic feet, roughly a bedroom set.
Take the aisle if the rental will run more than a couple of months, if anything seasonal is going in, or if you are storing during a renovation rather than between homes. Skip it only when you will open the door twice: once to fill it, once to empty it.
If the aisle pushes you over capacity, that is the answer, not a problem — check the size calculator with the access option ticked.
What this planner cannot decide for you
It assigns zones from what an item is, not from what it means to you. A box of tax records and a box of childhood photographs have identical dimensions and completely different retrieval odds — override the plan where you know better.
It also assumes a rectangular unit with a single door, which covers almost every US self-storage unit but not drive-up units with a roll door at each end, and not units with a supporting column.
Zone rules are judgment, not measurement. They are documented in full on the methodology page, separately from the item dataset, which is purely factual.
Before you load
Related questions
What should go in the back of a storage unit?
The heaviest items and anything you will not need until you empty the unit: appliances, workbenches, gym equipment, off-season furniture. Whatever goes against the back wall is sealed in behind everything else.
How do I keep things reachable in a storage unit?
Leave a center aisle and reserve the front third for anything you may retrieve. It costs about 15% of the capacity, which is why the size calculator treats access as a separate input rather than an afterthought.
Should heavy boxes go on the bottom?
Yes — at the bottom of each tier, not just at the bottom of the unit. A large box of books weighs around 130 lb and will crush whatever is beneath it. Keep the heaviest boxes at waist height or below.
Can I stack boxes on furniture in storage?
On a sturdy flat surface like a dresser top or a chest, with a blanket between, yes. Never on upholstery, glass or a finished tabletop — and never on anything you would be upset to find marked.
How much more fits if I pack in the right order?
Roughly 30% between careless and careful loading. That is usually a whole unit size, which is worth more than any packing material you could buy.