The suitcase looks heavy; the performance doesn’t have to be
A packed suitcase resists being lifted or thrown because its contents add mass. An empty one is easier to accelerate, so an actor can swing or toss it with less effort—and repeat the movement without hauling real luggage through take after take. That is the practical reason prop teams often remove what is inside.
Less weight makes a take easier to control
Film scenes may be repeated many times to adjust timing, camera position, or an actor’s movement. A gutted suitcase can be reset quickly and thrown along a more predictable path. It also puts less strain on the performer and reduces the chance that the prop will hurt someone if a toss goes wrong.
The trick is to remove the weight without removing the impression of luggage. From the camera’s viewpoint, the suitcase still has its shape, handle, and familiar motion; viewers supply the imagined contents. The audience sees a packed bag, while the actor handles a lightweight prop.
