2×5, 4×5, 10×5, 15×5: which small sizes are real, and how they compare to a 5×5.
The smallest standard self-storage unit is the 5×5 — 25 sqft, ~200 cubic feet at an 8 ft ceiling. There is no standard 2×5, 3×5 or 4×5 — a 2×5 or 3×5 is locker-sized (you get a locker where offered, otherwise a 5×5), and a 4×5 rounds straight to a 5×5. A 10×5 is just a 5×10 (50 sqft) and a 15×5 is just a 5×15 (75 sqft), both written width-first. 5×12 is not a standard size — you will be quoted a 5×10 or 5×15. Only 5×5, 5×10 and 5×15 are distinct units Public Storage actually rents in this range.
A 5×5 rents for roughly $45/mo nationally in 2026. Each step up adds floor area but usually costs less per square foot, so a 5×10 is not double the price of a 5×5. Searching specifically for a 4×5 storage unit? See the dedicated breakdown of what it is, what fits and what you pay.
Every small storage size, against the 5×5.
Cubic feet = floor sqft × 8 ft ceiling. “Standard” sizes are distinct units Public Storage rents; non-standard sizes show the real size they round to.
What each search actually gets you.
2×5 storage unit10 sqft · 80 cu ft
not standard → locker or 5x5A 2x5 is not a distinct Public Storage unit. At 10 sqft it is locker-sized: where a facility rents lockers you get one of those, otherwise the smallest thing you can book is the 5x5 (25 sqft).
3×5 storage unit15 sqft · 120 cu ft
not standard → locker or 5x5A 3x5 is not a distinct Public Storage unit. At 15 sqft it sits in locker territory (Extra Space lists lockers up to 4x5 and 5x5): where a facility rents lockers you get one of those, otherwise the smallest bookable unit is the 5x5 (25 sqft).
4×5 storage unit20 sqft · 160 cu ft
not standard → 5x5Public Storage does not rent a 4x5. The smallest distinct unit is the 5x5 (25 sqft). A search for a 4x5 unit will land you on a 5x5 in almost every market.
5×5 storage unit25 sqft · 200 cu ft
standard unitThe smallest standard self-storage unit. This is the size every metro page on this site prices.
5×10 storage unit50 sqft · 400 cu ft
standard unitDouble the floor of a 5x5. The next size up when a 5x5 will not close.
10×5 storage unit50 sqft · 400 cu ft
standard unitA 10x5 is a 5x10 written width-first. Same unit, same 50 sqft. Operators list it as 5x10.
5×12 storage unit60 sqft · 480 cu ft
not standard → 5x10 or 5x15Not a standard Public Storage size. It falls between the 5x10 (50 sqft) and 5x15 (75 sqft); you will be quoted one of those two.
5×15 storage unit75 sqft · 600 cu ft
standard unitA standard long-and-narrow unit. Three times the floor of a 5x5.
15×5 storage unit75 sqft · 600 cu ft
not standard → 5x15A 15x5 is a 5x15 written width-first. Same unit, same 75 sqft. Operators list it as 5x15.
Is there a 2x5 storage unit?
Not as a standard unit. A 2x5 is 10 square feet — locker territory. Where a Public Storage facility rents lockers you would be pointed to one of those; otherwise the smallest bookable unit is the 5x5 at 25 square feet. A 2x5 holds a few boxes and a couple of suitcases.
Is there a 3x5 storage unit?
Not as a standard unit. A 3x5 is 15 square feet — still locker territory. Public Storage's smallest distinct unit is the 5x5 at 25 square feet; where a facility rents lockers (Extra Space lists lockers up to 4x5 and 5x5) you would be pointed to one of those. A 3x5 holds a small stack of boxes, a couple of suitcases and a bin or two.
Is there a 4x5 storage unit?
No. Public Storage does not rent a 4x5. The smallest standard self-storage unit is the 5x5 at 25 square feet. A search for a 4x5 unit will be served by a 5x5 in almost every market.
What is a 10x5 storage unit?
A 10x5 is a 5x10 written width-first — the same 50-square-foot unit. Operators list it as a 5x10. It holds roughly the contents of one room.
What is a 15x5 storage unit?
A 15x5 is a 5x15 written width-first — the same 75-square-foot unit. Operators list it as a 5x15. It holds roughly the contents of a large bedroom or a one-bedroom apartment.
Is there a 5x12 storage unit?
5x12 is not a standard Public Storage size. At 60 square feet it falls between the 5x10 (50 sqft) and the 5x15 (75 sqft), so you will be quoted one of those two.
How big is a 5x15 storage unit?
A 5x15 is 75 square feet and about 600 cubic feet at the standard 8-foot ceiling. Public Storage describes it as holding the contents of a large bedroom or a one-bedroom apartment.