How do I choose between a Military Rotomolded Case and a steel case?

Answer: Count annual handling cycles. Under 100 with warehouse work, steel is enough. Above 300, or with airfreight, weight and corrosion decide it.

Why choose the heavier rotomolded body over aluminium?

Answer: The weight gap is small, the dent gap is not. An aluminium panel keeps its dent and needs 40 rivets drilled out.

How long does the mould take to pay back?

Answer: With a 96,000 mould at 300 units a year, year one carries 320 per case, and 160 at 600 units.

Timber is far cheaper, so why stop using it?

Answer: It is a single trip, plus fumigation. A body rated for 350 cycles costs under 2 per trip, against 100 for the crate.

Can the case go straight onto pallets and racking?

Answer: Yes. The 100 mm forklift opening matches a 1200 by 1000 mm pallet at six high. A rack beam span past 1.2 m needs a brace.

Military Rotomolded Case vs Alternatives: Where the Gap Is

Quick answer: A Military Rotomolded Case is weighed against welded steel, aluminium frame with riveted panels, and one-way timber crates. The differences sit in empty weight, dent recovery, trip count and pallet fit. Fix the mission profile first, then compare those four items.

Set the mission profile before comparing
Against steel cases: weight and corrosion path
Against aluminium frame cases: dents and field repair
Against timber crates: cycles and pallets
Four options on one whole-life sheet
FAQ

1. Set the mission profile before comparing

Most comparison arguments fail because each side prices a different life. One team quotes a case that flies once and is handled four times; the other buys a body that sees five hundred cycles a year. Those numbers fix wall thickness and hardware.

Four numbers belong in the enquiry: payload per case, dominant transport mode, annual handling cycles, and storage range. Once fixed, wall thickness and hardware grade are largely locked.

Profile item	Typical value	What it constrains
Payload per case	18 to 35 kg	Handle rating, base ribs
Transport mode	Air plus road	Empty weight, stack height
Annual handling	300 to 500 cycles	Latch and hinge life
Storage range	-40 to +60 C	Toughness, gasket hardness

2. Against steel cases: weight and corrosion path

At 120 litres, a Military Rotomolded Case weighs 13.8 kg empty against 24.5 kg for cold-rolled steel. That 10.7 kg gap becomes 85 kg when a six-person team carries eight cases at once.

Military Rotomolded Case: one grey case at a three-quarter angle, two lid grooves, black latches over a folding handle, a round pressure valve

On steel, corrosion starts at folded edges and weld spots: after 168 hours of neutral salt spray, hinge pins and the inner fold show rust points. Repair means grinding to bare metal, then primer and topcoat; colour matching is never exact. Polyethylene has no metal substrate, so a scratch cannot start galvanic corrosion; the only ageing path is wall thinning.

Item	Military Rotomolded Case	Steel case, 120 L
Empty weight	13.8 kg	24.5 kg
168 h salt spray	No metal substrate	Rust at fold and hinge pin
Deep scratch	Check wall, weld if needed	Grind and repaint
End of life	Ground, 70 percent reusable	Sold as scrap

3. Against aluminium frame cases: dents and field repair

An aluminium frame case uses 30 mm extrusion with 2.5 mm panels riveted on, so it is lighter, flatter. The weakness is local denting: a panel pressed by a case corner stops at about 3 mm and stays. In the field the only fix is a panel swap.

A 5.5 mm polyethylene wall behaves differently. Most blunt-edge dents spring back to within 1 mm in half an hour. Field repair is hot-air welding: a matching rod fuses into the groove at 220 C, a 60 mm split takes about 20 minutes, then a vacuum check. Swapping an aluminium panel means drilling out 40 rivets.

4. Against timber crates: cycles and pallets

A Military Rotomolded Case is costed per trip, and 350 cycles is a normal life before the body is ground for reuse. The pallet interface is overlooked: a 100 mm forklift opening lets four cases cover a 1200 by 1000 mm pallet exactly, six high.

Military Rotomolded Case: black cases stacked six high on timber pallets, orange racking and white walls receding down the warehouse aisle

A timber crate wins on one point: cheap, no tooling. That price ignores fumigation, since solid wood needs 24 hours and a marked certificate. The 8.6 kg of board is scrap once the crate is opened.

5. Four options on one whole-life sheet

Unit price belongs last. Take 300 cases a year over five years and place price, tooling and trip count side by side.

Option	Unit price	Tooling	Trips	Cost per trip
Military Rotomolded Case	620	96,000 steel mould	350	about 1.9
Steel case	480	8,000 jigs	80	about 6.0
Aluminium frame case	1,580	15,000 jigs	200	about 7.9
One-way timber crate	95	none	1	95

The 96,000 steel mould must be absorbed in three years, so rotomolded bodies lose to steel below roughly 300 units a year. The aluminium case costs more but returns 200 trips, and on a high-cycle route panel swaps eat that advantage.

Conclusion

No single option covers every profile. Steel wins on entry price, aluminium on weight, timber on one-off cost, and the Military Rotomolded Case on 350 trips, dent recovery and a corrosion path with no metal substrate.

This article discusses only the container (case body) side of specifications and design intent, and does not cover any handling, loading or use of the contents.