Oversize works have two options:
This means shipping the art stretched as-is, in a constructed wooden container. This method is usually more costly.
This is a more cost-effective, but still safe, method. First, the art is carefully removed from its stretcher bars, then the canvas is delicately rolled with layers of tissue/Glassine paper and plastic sheeting to keep it from sticking to itself. Finally, its packaged in a large tube or triangle with additional filler to prevent jostling.
If there is a concern that the art could be damaged by rolling, do not worry, this is a very common shipping method. Acrylic is very pliable, as long as it doesn’t reach extreme temperatures below approximately 40F / 5C. Northbound winter deliveries might be forewarned to postpone.