Smart packing fits 30-50% more in a unit than haphazard packing. The principles are simple — uniform box sizes, stack to the ceiling, leave a center aisle, protect fragile items — but most renters skip them and pay for unused space. Here’s how to pack like you actually thought about it.

Step 1: Pack everything before move-in day

The biggest packing mistake: showing up at the unit with everything unboxed and trying to figure it out on the spot.

Box everything at home first. Use uniform-size boxes (more on why below). Label everything. Bring it to the unit ready to stack.

Step 2: Use uniform box sizes

Uniform boxes stack cleanly to the ceiling. Mixed-size boxes waste 15-25% of vertical space because you can’t stack stable.

Best sizes:

• Small (16″ × 12″ × 12″) — for books and dense items
• Medium (18″ × 14″ × 16″) — for kitchen, decor, most general items
• Large (20″ × 20″ × 15″) — for clothes, linens, lighter items

Keep box weight under 35 lbs each so you can stack and move them.

Step 3: Pack heavy at the bottom, light at the top

Bottom of stack: boxes of books, kitchen items, tools. Middle of stack: general boxes. Top of stack: lightweight boxes (clothes, linens, decor).

Heavy on top crushes everything below.

Step 4: Disassemble furniture

Bed frames, dining tables, shelving units, large desks — take them apart. Bag and tape the hardware to the largest piece. Disassembled furniture stacks flat against walls and saves 50-70% of the floor space they’d occupy assembled.

Exceptions: sofas, dressers, large appliances stay assembled.

Step 5: Fill hollow furniture

Dresser drawers? Fill with clothes (folded, in bins, or in vacuum bags). Oven? If storing one, use the interior for small boxes. Refrigerator? If storing, clean thoroughly, prop the door open slightly, use interior for towels/linens.

Empty hollow space is wasted space. Fill it.

Step 6: Stack to the ceiling

Most storage units have 8-9 foot ceilings. Most renters stack 4-5 feet high and walk away. You just paid for 100 sq ft of floor space but only used 500 cubic feet of an available 800-900.

Stack stable, uniform boxes to within 6-12 inches of the ceiling. This is the single biggest unlock for unit capacity.

Step 7: Leave a center aisle

Counterintuitive but critical: leave a 2-3 foot center aisle from the door to the back wall. This lets you reach items in the back without unloading the front.

Without an aisle: you put valuable stuff in the back, then can’t reach it for 6 months without dismantling the front stack.

With an aisle: full unit access, all items reachable, peace of mind.

Step 8: Put rarely-accessed items in the back

What you’ll need first goes in the front. Seasonal items (Christmas decor) and long-term storage (old tax documents) go in the back.

Step 9: Protect fragile items

• Wrap individually in bubble wrap or packing paper
• Pack tightly in boxes with no room to shift (use crumpled paper or bubble wrap as filler)
• Label boxes “FRAGILE — THIS SIDE UP” on multiple sides
• Stack fragile boxes near the top, never the bottom

Step 10: Special-case items

Mattresses: Stand upright against a wall. Cover with breathable cloth (not plastic — plastic traps moisture, leads to mildew).

Upholstered furniture: Cover with breathable cloth. Avoid plastic for the same reason.

Wood furniture: If climate-controlled, no special prep needed. If standard unit, wax/polish before storage to protect from humidity swings.

Electronics: Original boxes preferred. If unavailable, wrap in bubble wrap and use small boxes with packing material. Climate-controlled strongly recommended.

Mirrors and artwork: Wrap in bubble wrap or moving blankets. Stand upright, never flat. Label “FRAGILE.”

Books: Pack flat or upright (never spine-up). Small boxes only (they get heavy fast).

Clothes: Vacuum bags compress 60-70%. Hanging clothes can stay on hangers in wardrobe boxes. Leather (jackets, boots) should have cedar blocks to prevent mildew.

Common packing mistakes

❌ Showing up with everything loose and “figuring it out” ❌ Stacking mixed-size boxes (unstable, wasted space) ❌ Filling boxes too heavy to move ❌ Skipping the center aisle (back items become inaccessible) ❌ Putting heavy items on top of fragile ones ❌ Wrapping upholstered furniture in plastic (traps moisture) ❌ Storing wood furniture without protection in non-climate units ❌ Putting electronics in non-climate units long-term

Climate-controlled vs. standard packing

In climate-controlled units, you can pack normally without worrying about temperature/humidity swings.

In standard (non-climate-controlled) units, take extra precautions:

• All wood furniture should be polished/waxed first
• All electronics in sealed plastic bins with silica gel packs
• All books and photos in sealed plastic bins
• Mattresses elevated off the floor (use pallets or shelving)
• More frequent inspection (every 30-60 days vs. quarterly)

Ready to pack and store?

Need help thinking through what size unit you need? Check our Size Guide → or call 888-684-4933.