Why containers get rolled
- Overbooking. Carriers accept more bookings than a vessel can carry, expecting some to cancel.
- Missed cut-offs. The container gated in late, or the shipping instructions or VGM arrived after the documentation cut-off.
- Missing VGM. Under SOLAS, a container cannot be loaded without a verified gross mass declared by the shipper.
- Space or weight limits. The vessel runs out of slots, reefer plugs or weight allowance on the day.
- Schedule changes. A delayed or skipped port call pushes cargo to the next sailing.
What it does to your shipment
A roll moves the departure to the next available vessel, which may be days or weeks later, and every downstream date moves with it: arrival, customs clearance, trucking, and the free-time clock at destination. Because the original schedule often stays in the booking, a rollover is easy to miss until the cargo is already late.
What to do when it happens
- Confirm the new vessel and voyage with the carrier or forwarder.
- Recalculate the arrival date and tell the consignee.
- Move the truck booking and warehouse slot.
- Check whether documents and any letter-of-credit dates still work.
How to reduce the risk
- Book early in peak season and confirm space close to departure.
- Gate in and submit shipping instructions and VGM well before the cut-offs.
- Track the container, not the booking: a live position shows a rollover as soon as the box stays behind.
ShipTastic flags a rollover and updates the ETA from the vessel the container is actually on. See how our ETA works.