What Size Shipping Container Do You Need?.

The most common sizing mistake we see isn't buying too small. It's buying too big. People pay for forty feet of steel to store twenty feet of stuff, then give up a chunk of their property to the empty half.

So before you default to the biggest box, walk through this.

Stage it in your head first

Picture everything you're storing laid out in a single-car garage. That garage is roughly the capacity of a 20-foot container, give or take. If your pile fits with room to walk around it, a 20 does the job. If you're picturing two garages, you're a 40-foot customer. If everything fits on a couple of pallets, look at a 10.

What each size is actually for

10-foot containers take up about as much ground as a garden shed and fit places a bigger delivery truck can barely reach. We sell them for tool storage, tight urban lots, and sites where a 20 physically won't go. Per square foot they're the priciest way to buy container space, so buy one for the footprint, not the economics.

The 20-footer is the default for a reason. It holds the contents of a typical two-to-three-bedroom move, fits on most residential properties, and delivers without drama. When someone genuinely can't decide, this is usually the answer.

40-foot containers are for equipment, whole-house storage, and commercial inventory. The catch isn't the box, it's the delivery: the truck needs a long, straight run to set one down. We wrote up the exact clearances in our tilt-bed delivery guide, and it's worth reading before you fall in love with a 40.

Measure the site before you measure the stuff

Plenty of people pick the right size for their gear and the wrong size for their land. The container needs its own footprint plus room for the truck to line up and pull forward, typically a straight approach quite a bit longer than the box itself. Overhead lines, tree limbs, and soft ground all matter. Our site preparation page walks through the whole thing.

Two 20s vs one 40

If you're on the fence at the top end, consider a pair of 20s instead of one 40. You can place them separately, sell one later, or keep clean storage in one and greasy storage in the other. The trade-off is two sets of doors to secure and a bit more total cost for the same cubic feet. We compared them head to head in our 20 ft vs 40 ft article.

Don't forget height

Length gets all the attention, but ceilings matter too. A standard container runs about 8 ft 6 in tall outside, typical across the industry. If you're storing anything tall or planning full shelving, a high-cube adds another foot of headroom. For boxes and furniture, standard height is plenty.

Our two-minute rule

Buy the size that fits your stuff plus about 25 percent. That covers the things you haven't thought of yet, and there are always things you haven't thought of yet. Going bigger than that is usually wasted money. Going exact-fit means unloading half the container every time you need something from the back wall.

One more thing: containers only have doors where they have doors. A 40-footer loaded front to back is a forty-foot-deep closet. If you'll need regular access to everything, that argues for a shorter box, or for a different door configuration entirely.

Full measurements for every size live on our dimensions page. Once you've got a number in mind, compare 10s, 20s, and 40s in our inventory, or call (302) 579-5617 and we'll size it with you in five minutes.

Disclosure: XIVstorage sells the shipping containers discussed in this article. Typical figures are planning guidance; the product page and unit plate control exact specifications.