Container Condition Grades: A Colorado Buyer's Guide

Why Condition Grade Matters

The condition grade sets the warranty that comes with a unit. Grade also determines whether you can convert the unit, whether you can store valuable equipment inside, and whether the visible cosmetics matter for your application.

The grades below run from most worn to least worn.

Economy (No Certification)

The lowest grade described here. A used container that has been retired from active shipping but has not been certified to a specific standard. Expect:

• Surface rust on most external panels.
• Paint chipping, faded original branding, evidence of multiple repaints.
• Dents and dings on side walls and roof. None should be deep enough to compromise structural integrity.
• Floor wear: original plywood with industrial residue, possible burn marks, possible patches.
• Door hardware functional but stiff.

Best for: Rough storage on a working ranch or jobsite, where appearance is not a factor and the unit will be locked and forgotten. Not recommended for storage of valuable, rust-sensitive, or moisture-sensitive contents without ventilation upgrades.

What it looks like: Visible rust streaks, chipped paint, repaired patches. Doors close and seal but show wear. The unit is unmistakably second-hand.

Wind and Water Tight (WWT)

WWT is a condition grade for used containers. It means the container has been inspected and certified to keep wind and water out. Specifically, it has:

• Door seals that keep weather out.
• A roof without holes or rust through-spots.
• A structurally sound floor. It may show wear but has no rot, no holes, and no soft spots.
• Solid walls. Surface rust and cosmetic dings are acceptable.
• Lock boxes and door hardware that function.

WWT is not the same as cargo-worthy. WWT confirms the container keeps wind and water out. Cargo-worthy adds the structural certification needed for international ocean shipping.

Best for: General storage, contractor jobsite tools, ranch and farm equipment, household goods during a renovation, on-site materials during construction.

What it looks like: External panels show some surface rust and cosmetic wear, but doors close cleanly and seals look intact. The unit looks used but functional.

Cargo Worthy (CW)

Cargo-worthy is a structural certification, not just a cosmetic grade. A CW container has been inspected to the IICL (Institute of International Container Lessors) standard and certified safe for international ocean shipping. That means:

• All structural members (corner castings, side and end frames, undercarriage) inspected and confirmed sound.
• Walls, roof, and floor confirmed weatherproof and load-rated.
• Door hardware tested.
• The unit can be loaded onto a ship and sent across an ocean without further inspection.

For storage purposes, CW is functionally similar to WWT. The difference is the structural certification.

Best for: Buyers who plan to ship the container internationally, and buyers who want a documented certification for resale or insurance purposes.

What it looks like: Visible age on the exterior, as with any used container.

One-Trip (Sometimes Sold as Like-New)

A one-trip container has made a single ocean voyage, typically loaded from a manufacturing facility in Asia to a North American port. After unloading, the unit goes into the resale market essentially brand new. Specifically:

• Original factory paint, with minor scuffs from the single shipping journey.
• Floor in excellent condition, no industrial wear.
• Doors and seals tight, lock boxes pristine.
• Interior clean and dry, no residue.
• Minor cosmetic marks consistent with one ocean trip and one truck transfer.

One-trip costs more than WWT. It suits a conversion project, food-adjacent storage, a high-visibility placement, or a clean-finish workshop or office build.

Best for: Conversion projects (offices, workshops, tap rooms, tiny homes), food-adjacent or sensitive storage, customer-facing placement, anyone who wants a container that looks new.

What it looks like: Factory paint, sharp graphics, clean interior. Looks like a new container with light handling marks.

The IICL Standard, Briefly

The Institute of International Container Lessors maintains the inspection standard used to certify cargo-worthy containers. IICL inspectors check structural members, weatherproofing, door function, and floor integrity against a published criteria set.

How to Choose for Your Use Case

The match between use case and grade in Colorado:

Use Case	Recommended Grade
Construction jobsite tools and materials	WWT
Ranch or farm equipment storage	Used or WWT
Household goods during renovation	WWT
Office, workshop, tap-room conversion	One-trip
Tiny home or container home build	One-trip
Long-term acreage storage	WWT
Insurance-grade documentation needed	Cargo-worthy
Customer-facing placement (retail, hospitality)	One-trip

Inspecting Before You Buy

Whatever grade you select, the visual checklist is the same:

1. Floor. Walk it. Listen for soft spots. Look for water staining or rot.
2. Door seals. Look for daylight around the closed doors from inside while a second person stays outside with the doors unlatched. No daylight means the seals are tight.
3. Roof. If you can climb up safely, check for dents that pool water, rust through-spots, and obvious patches.
4. Corner castings. The eight corner blocks should be intact and free of major damage. They carry the entire load when the unit is lifted or stacked.
5. Side walls. Look for bulges, deep dents, and heavy rust patches. Surface rust is normal; structural rust is not.

Ask which inspection and certification applies to the quoted unit, and ask about photos of your specific unit before dispatch if cosmetics matter.

Delivery and Grade in Colorado

Delivery is scheduled after payment and site review.

Delivery to the Front Range, Northern Colorado, the Western Slope, and mountain communities depends on location, weather, and site access.

Frequently Asked Questions About Container Grades