How does an Equipment Case seal compare with a flight case?

Answer: Two classes on one test. A solid gasket holds IP67 for thirty minutes at a metre; a labyrinth extrusion only turns splash.

Is lower weight per litre always better?

Answer: No. A 0.09 kg/L tote saves effort, but its 1.8 mm wall bows by the third tier.

Can a flight case be upgraded to that seal?

Answer: Not really. The seal needs a groove moulded with the lid, and a jointed plywood frame cannot compress a gasket evenly.

Where does protection land after a cut-out?

Answer: On location. A hole in the thickened pad with a gasket holds IP67; a bare hole leaves splash resistance.

Which spares should be stocked?

Answer: Gasket, latch and hinge pin: one gasket per case every two years, latches at ten per cent of the fleet, pins per ten cases.

Equipment Case Comparison: Where the Alternatives Fall Short

Quick answer: An Equipment Case does not win every count. It trades five traits against four alternatives: seal, weight per litre, cut-out effort, closure life and spare parts.

How an Equipment Case Compares with Four Alternatives
Protection Ratings and Where the Seal Sits
Weight per Litre and Cut-out Effort
Open-close Life and Spare Part Cost
Choosing by Use Frequency
FAQ

1. How an Equipment Case Compares with Four Alternatives

The baseline Equipment Case is a single-shot moulding with a solid gasket on the rim, two latches and a 3.0 mm wall. A 50 litre cavity in an 8.6 kg shell gives 0.17 kg per litre, twice a tote and under half a flight case.

Each rival has one strength: plywood re-cuts on site, 1.2 mm aluminium resists puncture, a 1.8 mm tote costs least, 1680D over 30 mm EVA absorbs best.

Type	Protection	Weight per litre	Cut-outs	Closures	Spares
Equipment Case	IP67	0.17 kg/L	gasket	20,000	factory
Flight case	splash proof	0.38 kg/L	easiest	12,000	trade
Aluminium case	IP55 class	0.31 kg/L	reinforcement	8,000	extrusion
Thin-wall tote	no seal	0.09 kg/L	not advised	5,000	replace
Soft bag and insert	dust only	0.06 kg/L	sewing	zip 30,000	insert

Protection and closure life cannot be retrofitted; weight and cut-out time can be bought back.

2. Protection Ratings and Where the Seal Sits

An IP rating describes the seal path, not the wall. Here it is a 60 Shore A gasket compressed 25 to 30 per cent by the rim groove. Under-compress and water passes; over-compress and the rubber takes a set, so the second closure leaks.

Equipment Case: close view of a black case corner, rim groove and gasket channel visible, foam trimmed flush to the inner wall, rounded corner

A flight case runs a labyrinth of two serrated extrusions: splash yes, immersion no. Aluminium seals on a foam strip and riveted seams, and a 400 mm case carries over 60 rivet holes, each a leak path.

At one metre for thirty minutes the solid gasket shows no ingress, the foam strip weeps, the labyrinth seeps, the zip fails inside a minute.

3. Weight per Litre and Cut-out Effort

At 50 litres the rivals run 19 kg, 15.5 kg, 4.5 kg and 2.9 kg against 8.6 kg. Load 20 kg of gear into the two lightest and every staircase needs a hand-over.

Cut-outs split the field wider. The Equipment Case leaves a 2.5 mm pad where panels sit, so a 60 mm hole takes 40 minutes with the gasket seated. Plywood takes 20 minutes plus 24 hours of cure; aluminium 55 minutes plus riveted reinforcement.

One or two changes favour plywood; past five revisions, moulded inserts win and the case returns to service that afternoon.

4. Open-close Life and Spare Part Cost

The limit sits in the latch and hinge pin, not the shell. POM catches on stainless pins held 420 N new and 350 N after 20,000 closures, above the 300 N service line.

Equipment Case: a navy blue case side-on, two latches on the front face, a round valve cap and folding handle, steel bench and brick wall

Butterfly catches on a flight case wore a 0.6 mm groove by 12,000 closures; aluminium hinges reached 0.5 mm of play at 8,000, and a rocking lid shears its gasket.

Spares are a five year number: a gasket at 45 and a latch at 18 keep annual upkeep near 30, while corners at 12 look cheap until damp plywood writes the shell off.

20 cases, 5 years	Equipment Case	Flight case	Aluminium case
Purchase	1.00	1.35	1.60
Spares	0.08	0.22	0.31
Labour	0.05	0.12	0.10
Write-off	2%	15%	8%

5. Choosing by Use Frequency

Three questions in order: closures a year, water in transit, panel revisions in five years. When two answers agree, stop comparing.

Under 200 closures a year between store and truck, a tote with a custom insert is cheapest, with desiccant covering the gap. Above 500 outdoors, the sealed combination pays.

The common error is treating a flight case as the upgrade: it wins on cut-out freedom, loses on sealing.

Conclusion

There is no absolute winner, only an order of traits: the seal decides whether water enters, mass decides who carries it, cut-out time sets the revision rhythm, and spares decide whether the shell is worth repairing in year five. Pick the option whose weakest trait never appears on your route, and the Equipment Case holds up.

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.