The ornamental design for an advertisementscreen with a backpack case, as shown and described.
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1. Advertisement screen with a backpack case
1.1: Perspective view showing the state when the screen is off
1.2: Front
1.3: Back exploded view showing the state when the screen is on
1.4: Left
1.5: Back exploded view showing the state when the screen is on
1.6: Perspective view showing the state when the screen is on