40ft Storage Container – Used, Watertight Seals and Locks

A Wind and Watertight 40ft Shipping Container for Everyday Storage

When people ask for a wind and watertight 40ft shipping container, they usually want one thing confirmed: that whatever goes inside stays dry. That is exactly what the WWT grade describes. The roof, walls, and door seals have been checked so the interior stays sealed against rain and driving wind, while the steel carries the honest cosmetic wear of a unit that has done real work.

Forty feet is the size to choose when you are consolidating. One long box replaces a cluster of sheds, trailers, or rented units, and everything ends up behind a single set of doors and one padlock instead of five.

Specifications at a Glance

• Condition grade: wind and watertight (WWT) — dry and sealed, not certified for ocean cargo
• External dimensions: 40' x 8' x 8'6"
• Internal dimensions: approximately 39'5" x 7'8" x 7'10"
• Door opening: 7'8" wide x 7'6" high at one end
• Capacity: roughly 2,390 cu ft
• Tare weight: approximately 8,200 lb (about 3,720 kg)
• Footprint: about 320 sq ft of floor, comparable to a generous two-car garage

Getting the Most Storage Out of 40 Feet

The trap with a long container is turning it into a tunnel you can only reach the first ten feet of. A little planning at the start keeps all 320 square feet usable.

• Keep a center aisle and rack both side walls rather than stacking to the doors
• Store the least-used items at the far end and rotate seasonal gear toward the doors
• Add shelving above waist height so the floor stays clear for pallets
• Contractors: assign each end to a different crew or trade to avoid daily digging
• Farms and estates: keep feed and chemicals separated with a simple internal partition

Site Prep, Condensation, and Delivery

Set the container on four bearing points, level in both directions, and raise it slightly off the dirt so air moves underneath. Condensation is the one issue that catches new owners out: a sealed steel box will sweat when warm humid air meets cold steel, so keep the vents clear, avoid storing damp material, and consider a vapor barrier or insulation if you are storing anything sensitive. For delivery, allow the 40 ft length plus roughly 40 ft of straight run and about 15 ft of overhead clearance. Shipping is a flat $500 to all 50 states. Browse more units in the 40ft container category, see condition grades across our used shipping containers, compare the preloved 40ft wind and watertight unit, or work through our buyers guide if you are choosing between grades.

Frequently Asked Questions

What is the difference between wind and watertight and cargo-worthy?

Wind and watertight means the container is dry and sealed for storage use. Cargo-worthy means it has also been inspected and certified as fit for international shipping, which is a stricter structural standard and usually costs more. If the container will sit on your property and never go back to sea, WWT is normally the sensible grade to buy.

Does surface rust mean the container is failing?

Not usually. Weathering steel forms a protective patina, and light surface rust on a used container is cosmetic rather than structural. What matters is whether the roof and seals are sound. If you want the unit to look sharp long term, a wire brush and a coat of exterior-grade paint every few years keeps it in good order.

Can I stack two of these on my property?

Containers are engineered to stack when loaded through the corner castings, but stacking on private ground raises questions about ground bearing, twist locks, wind loading, and local rules. Check with your municipality before planning a stacked arrangement, and use proper stacking hardware rather than simply setting one box on another.