Storage Unit Sizes: What Actually Fits in Each

Storage units are sold by floor dimensions but live in three dimensions — and the difference between "it all fit" and "why is the couch at the front" is knowing what each size honestly holds. The guide, with NYC apartments as the unit of measure:

Size by size

• **5×5 (a closet):** boxes, seasonal gear, a bike, a chair — the student summer unit or overflow closet, ~10–15 boxes with room to reach them
• **5×10 (a walk-in closet):** a studio's contents tightly packed — mattress on edge, small couch, dresser, 15–20 boxes
• **10×10 (half a garage):** a 1-bedroom apartment — the between-moves standard: couch, bed set, dining pieces, 30–40 boxes
• **10×15:** a 2-bedroom, or a 1BR with breathing room and an access aisle
• **10×20+:** house territory, or business inventory

The tricks that change the math

• **Height is free volume:** most units run 8-foot ceilings — sturdy stacking (heavy low, boxes high) fits half again the floor math
• **Disassemble like a move:** bed frames and table legs off (hardware bagged) — assembled furniture is mostly stored air
• **Mattresses on edge, bagged** — flat mattresses are the biggest floor-space thieves
• **The access aisle:** leave one, with labels facing out and might-need items in front — a unit you can't enter is a very expensive time capsule

The two decisions besides size

**Climate control** — worth it for wood, electronics, fabric, and anything sentimental through NYC summers (the humidity case). **Location** — a cheaper unit an hour away costs truck time on both ends; price the whole trip. And on insurance: facilities require coverage, and your renter's policy may already extend to storage — check before buying theirs.