Shipping Space Release vs. Container Release: Key Differences and Process Guide in Ocean Freight

Definition of Shipping Space Release:
Also known as space confirmation or allocation of space, this occurs when the shipping line reviews the booking request from the freight forwarder/shipper (covering price, sailing schedule, etc.) and officially assigns vessel space to the cargo. Note: This only confirms there is space onboard — it does not mean containers have been released yet.

Definition of Container Release:
After space is confirmed, the shipping line issues a document (commonly referred to in South China as S/O – Shipping Order) allowing the freight forwarder/shipper to pick up empty containers.
Steps: With this release document → collect empty container at depot → load cargo → return full container.

I. Shipping Space Release Process

Booking Request Submission

• By: Freight forwarder or shipper

• Content: Cargo details (commodity, weight, volume, container type/quantity), POL/POD, sailing schedule (ETD/ETA), special requirements (hazardous cargo, temperature control, etc.)

Space Confirmation

• Issued after carrier’s review, including:

  • Vessel/Voyage

  • B/L Number

  • CY Closing date

  • ETD (Estimated Time of Departure)

  • Validity period for space (cargo must be loaded before this date)

  • Some routes may require prepaid freight or booking deposit

Next Steps

• Use space confirmation to apply for container release (pick-up).

• Arrange trucking, customs clearance, and stuffing.

II. Container Release Process

Container Pick-up Application

• Provide: Booking number, pick-up location, container type & quantity

• May require deposit or guarantee (commonly known as container deposit)

Issuance of Release Order / EIR

• Issued by carrier or terminal, includes:

  • Container number(s)

  • Vessel/Voyage

  • Pick-up/Return depot

  • Validity period

Container Pick-up and Loading

• With the release order, collect empty container from depot

• Inspect and sign-off

• Deliver to factory for stuffing

• Return full container to terminal or designated yard

III. Common Questions & Quick Reference

• Is space release = container release?
  No. Space release only guarantees vessel space. Container release depends on actual equipment availability.

• Can shipper assign container number/seal number?
  Some carriers allow this for documentation purposes.

• Why does S/O ETD keep changing?
  Sailing schedules change. Final ETD is based on the latest release info.

• What if booking is cancelled or rolled after stuffing?
  Usually due to overbooking; the carrier may cancel unstuffed space or roll containers to the next vessel.

• Why is space not released after booking?
  Possible reasons: freight not confirmed, incomplete booking details, or tight capacity.

• What if booking or space info changes?
  Must update carrier immediately, especially for sensitive cargo or LCL volume/weight changes.

• Time gap between space release and container release?
  Typically 1–3 days, but varies by route, carrier, and market conditions. In special cases, delays may occur.