How to pack a storage unit
Pack a storage unit by loading heaviest and least-needed items against the back wall first, building in tiers to the ceiling with heavy items low, and leaving a centre aisle if you will need access. Good packing holds roughly 30 per cent more than careless packing — often the difference between one unit size and the next.
- +30% capacity from good packing
- Heavy low, light high
- Aisle costs 15%, saves your sanity
Decide the layout first
Three layouts cover almost every unit. Choose before you load, not halfway through.
| Layout | Capacity | Access | Use when |
|---|---|---|---|
| Full fill, no aisle | 100% of usable | None until you empty it | Short-term storage between homes |
| Centre aisle | About 85% | Everything reachable | Rentals over a few months |
| U-shape | About 65% | Excellent | Business inventory, seasonal rotation |
The visualise the unit lets you place furniture into each layout to scale before you commit.
Loading order
- Floor protection. Pallets or plastic sheeting. Concrete wicks moisture, and a mattress on bare concrete will smell within a season.
- Appliances and heavy furniture against the back wall. Refrigerators go in with the doors taped ajar, never sealed shut.
- Large furniture next, standing on end where the shape allows. Sofas on end recover a great deal of floor.
- Heavy boxes as the base layer of each tier, no higher than waist height.
- Light boxes above, to the ceiling if you are packing tight.
- Frequently needed items last, in the front third, facing the door.
Rules that actually change capacity
- Uniform box sizes. Mixed sizes stack badly and waste more space than any other single habit.
- Fill every box completely. A half-full box collapses under the one above it.
- Disassemble beds and tables. Recovers 15–20% of their volume.
- Use the vertical space. Most units are 8 ft tall and most people stop at 5 ft.
- Fill hollow spaces. Drawers, appliance interiors and the inside of a wardrobe are all storage.
Between careless and careful packing there is roughly 160 cu ft of difference in a 10x10 — which is a whole size step. See the 10x10 size guide for what that means in furniture.
Protecting what you store
How much you fit depends on the size you chose — storage unit size calculator and capacity by unit size both work from the same model as this guide. Cover upholstery and mattresses with breathable covers rather than plastic, which traps condensation. Wrap wood furniture in moving blankets, not shrink wrap directly against the finish. Stand mirrors and artwork upright, never flat. Leave a small gap between stacks and the walls for airflow.
If any of this is going in for more than a season, read climate-controlled versus standard storage before deciding you do not need the upgrade.
Related questions
How do I fit more into a storage unit?
Use uniform boxes, fill every box completely, disassemble bed frames and tables, stack to the ceiling and fill the inside of drawers and appliances. Together these are worth about 30% more capacity.
Should I leave a walkway in my storage unit?
If the rental will last more than a couple of months, yes. It costs about 15% of the capacity and is the difference between a unit you can use and a wall of boxes you have to dismantle.
Can I stack boxes on furniture?
On sturdy flat surfaces like a dresser top or a chest, yes, with a blanket between. Never on upholstery, glass or anything with a finish you care about.