Flying with Equipment Cases: Airline Rules, ATA 300 and Transit Prep
Most airlines accept checked cases up to 158 cm (62 in) in total linear dimensions and 23 kg standard weight, beyond which oversize/overweight fees apply. Professional flight cases are built to ATA 300 Category 1 for repeated air transport. The two most common travel problems are lithium-battery rules — which apply to your contents, not the case — and cabin-altitude pressure differences that bulge or lock a fully sealed case unless it has a pressure relief valve.
§01Checklist before the airport
- Measure L+W+H including wheels and handles. 158 cm is the common checked limit; confirm with the carrier, low-cost airlines are stricter.
- Lithium batteries: spare lithium-ion batteries and power banks go in carry-on, ≤100 Wh generally without approval; installed batteries follow equipment rules. Airline cargo rules may differ from passenger rules.
- Locks: use TSA-compatible locks for US-bound checked baggage so security can open without cutting latches.
- Pressure valve: confirm it is clean and moving freely; a sealed case from a cold hold will equalize with an audible hiss on arrival.
- Documentation for pro gear: a serial-numbered photo manifest speeds both customs and insurance claims.
§02Passenger flight vs air freight
| Mode | Governing rules | Certification to look for |
|---|---|---|
| Checked baggage | airline conditions of carriage; IATA lithium rules | case robustness is your own risk |
| Air freight (cargo) | IATA T1/T2 packaging rules, DG where applicable | ATA 300 Cat. 1, ISTA procedures |
| Touring/demo programs | repeated trips, handlers, trucking legs | ATA 300 Cat. 1 with flight-grade hardware |
§03Why the case feels different after a flight
Cargo holds are pressurized to roughly 2,400 m equivalent altitude, and temperatures swing far outside cabin range. A sealed case experiences both a vacuum on ascent and overpressure on descent. Membrane pressure valves equalize automatically; twist valves should be opened shortly before and after the flight. Neither is a safety issue for the aircraft — it is purely about protecting your latches and gaskets.