Vesicle transport between the endoplasmic reticulum (ER) and…

Vesicle transport between the endoplasmic reticulum (ER) and the Golgi occurs in both directions. Imagine that a researcher added a drug to cells that inhibited vesicle transport from the Golgi to the ER, but did not affect vesicle transport from the ER to the Golgi. If you observed cells with a microscope after the drug was added, what would you expect to see?