How you pack a storage unit decides two things: how much you can fit, and what condition it is in when you collect it. Pack it well and you can often rent a size smaller, which saves money every month you store. Pack it badly and you waste paid space, risk damage, and find yourself climbing over boxes to reach the one thing you need.
This guide walks through packing a unit properly, from preparing your belongings to stacking the unit floor to ceiling. Not sure what size you are working with yet? Our size calculator will tell you before you book.
Start with the right materials
Good packing starts before moving day. Get these together first:
- Sturdy, uniform boxes. Matching boxes stack squarely and use the full height of the unit. Mismatched and second-hand boxes collapse and waste space. Double-walled boxes are worth it for heavy items.
- Packing tape, bubble wrap, and packing paper for protecting fragile items and reinforcing box bases.
- Furniture covers and blankets rather than plastic sheeting, which traps moisture against wood and upholstery.
- Pallets or a few lengths of timber to keep boxes off the floor if you are storing long term.
- A marker pen and a notepad or your phone for labelling and keeping an inventory.
Prepare your belongings before they go in
A little preparation prevents most storage damage:
- Clean and dry everything. Damp or dirty items attract mould and odours over weeks in storage. Make sure fridges, washing machines, and anything that held water are completely dry.
- Dismantle large furniture. Take apart beds, tables, and flat-pack units. Flat components store against a wall and free up huge amounts of space. Bag the screws and tape them to the item.
- Empty and defrost appliances, then leave the doors slightly ajar so they do not develop a smell.
- Wrap fragile items individually and pack them snugly so nothing shifts.
- Treat wooden furniture with polish and consider a moisture absorber in the unit for long stays.
Pack boxes the right way
The way you fill a box affects how well it stacks and survives:
- Heavy items in small boxes, light items in large boxes. A large box full of books is impossible to lift and will burst. Keep heavy things in small, strong boxes.
- Fill every box completely. Pad gaps with paper or soft items so the box keeps its shape under weight. Half-full boxes crush when stacked.
- Keep box weight manageable, around what you can comfortably carry, so you can restack the unit without a struggle.
- Label every box on the side, not the top, with the room and contents, so you can read labels once boxes are stacked.
- Keep a simple inventory of what is in each numbered box. You will find things in seconds instead of unpacking half the unit.
Stack the unit floor to ceiling
This is where space is won or lost. A storage unit is sold by floor area, but you are paying for the volume, so use the height.
- Keep boxes off the floor on a pallet or timber, especially for long-term storage, to protect against any damp.
- Heaviest and sturdiest items at the bottom: appliances, dressers, and strong boxes form the base layer.
- Build upwards in stable columns, lightest items on top, so nothing is crushed and the stack does not topple.
- Stand sofas on end and store mattresses flat or upright against a wall to reclaim floor space.
- Fill the hidden gaps. Use drawers, wardrobes, and appliances to store smaller boxed items inside them. Slide flat items like mirrors and table tops down the sides.
- Protect what you stack. Put covers between items that could scratch, and never rest heavy boxes directly on upholstery or screens.
Leave an access aisle
The single most common mistake is packing the unit solid, then needing something at the back. Avoid it:
- Leave a narrow walkway down the middle or one side so you can reach the back without unloading everything.
- Put anything you will need sooner near the front, and seasonal or long-term items at the back.
- Face labels outward towards the aisle so you can find boxes at a glance.
- Keep an eye on what you store near the door, as it is the easiest to grab but also the first thing in view.
What not to store
Every storage contract bars certain items, and packing them risks your goods, your cover, and other customers' belongings. Do not store:
- Perishable food or anything that can rot or attract pests.
- Flammable, hazardous, or explosive materials, including petrol, gas bottles, and paint.
- Living things, plants or animals.
- Cash, jewellery, and irreplaceable valuables, which should stay with you.
- Anything illegal.
For more on keeping stored goods secure and properly insured, see our guide on whether self storage is safe.
The bottom line
Packing a storage unit well is mostly about three habits: use strong, uniform boxes filled completely, dismantle and protect furniture before it goes in, and stack upwards in stable columns while leaving an aisle to reach the back. Do that and you will fit more into a smaller unit, keep everything in good condition, and find what you need without emptying the whole space. Work out your size with our size calculator, then compare storage facilities near you to book.
Frequently asked questions
The answers below cover the packing questions we are asked most. For the right unit size, try our size calculator before you book.