20-Foot Open Top
Tarpaulin roof over a 20-foot frame for crane loading and over-height cargo.
Learn moreOversized & Project-Cargo Containers
Collapsible Flat Rack
Open steel deck with collapsible end walls for heavy, wide and irregularly shaped cargo. Available in 20' and 40' lengths.
20 ft · 40 ft
Container overview
The collapsible flat rack is a reinforced steel deck fitted with end walls and no side walls or roof. End walls fold flush for compact empty stacking and repositioning, then lock upright to contain and secure cargo in transit.
It handles pieces that exceed the width or height of a closed container, including machinery, transformers, vehicles, boats, cable reels and structural assemblies. Load concentration matters more than total weight on a flat rack, so the bearing points of the cargo should be checked against the deck rating.
Pro Box supplies collapsible flat racks in 20-foot and 40-foot lengths. Cargo wider or taller than the rack is treated as out-of-gauge and needs carrier approval before booking.
Also called20' FR · 40' FR · flatrack · bolster · plat
Key features
- Heavy-duty steel deck rated for concentrated point loads
- Collapsible end walls for compact empty stacking
- No side walls or roof, so cargo can overhang where approved
- Lashing rings and stanchion pockets along both deck edges
- Loading by crane, forklift or roll-on
- Available in 20-foot and 40-foot lengths
- Out-of-gauge cargo needs carrier approval before booking
Technical specifications
Inside dimensions
| Length | Varies by manufacturer or model |
|---|---|
| Width | Varies by manufacturer or model |
| Height | Varies by manufacturer or model |
| Floor area | Varies by manufacturer or model |
| Cubic capacity | Not applicable — open deck equipment |
Outside dimensions
| Length | Varies by manufacturer or model |
|---|---|
| Width | 8' |
| Height | Varies by manufacturer or model |
Door opening
| Width | Open |
|---|---|
| Height | Open |
| End wall configuration | Flush-folding, lockable upright or collapsed |
| Other opening / feature | Flush-folding end walls |
Weights
| Tare weight | Varies by manufacturer or model |
|---|---|
| Maximum payload | Varies by manufacturer or model |
| Maximum gross weight | Varies by manufacturer or model |
Certification and identification
| ISO size/type code | 22P3 / 42P3 — confirmed per unit |
|---|---|
| ISO size group | 22 (20 ft) / 42 (40 ft) |
| CSC information | Cargo-worthy units carry a valid CSC safety approval plate |
Container specifications may vary by manufacturer, production year and individual unit. Confirm the specifications of the assigned container before booking, loading or modifying the equipment.
Usable dimensions, tare and payload depend on length, cargo support and end-wall configuration. Pro Box confirms specifications for the exact unit assigned.
Specifications last reviewed 2026-08-24. · Representative carrier specification. Reference specification
Condition and compliance
- New / one-trip units, subject to origin availability
- Used cargo-worthy units with valid CSC plating
- Specialty-certified equipment where the project requires it
Equipment moving on an international booking has to satisfy the applicable carrier, CSC, inspection, prefix, marking and documentation requirements before it is loaded. Wind and watertight condition describes weather protection only, and is a separate standard from cargo-worthy condition.
Common applications
- Project cargo
- Oversized or out-of-gauge cargo
- Industrial equipment
- Construction
- Government and military projects
Related containers
40-Foot Open Top
Full-length removable roof for long machinery and crane-loaded project pieces.
Learn moreNeed this container for your project?
Tell us what you are shipping, where the container is needed and when the project begins. Pro Box will help identify the appropriate equipment, condition and documentation requirements.