United Parcel Service Inc. imposed shipping restrictions on some large retailers such as Gap Inc. and Nike Inc. this week, an early sign that the pandemic-fueled online shopping season is stretching delivery networks to their limits.

The delivery giant

 on Cyber Monday notified drivers across the U.S. to stop picking up packages at six retailers, including L.L. Bean Inc., Hot Topic Inc., New Egg Inc. and Macy’s Inc

 , according to an internal message reviewed by The Wall Street Journal and confirmed by UPS workers in different regions. “No exceptions,” the message said.

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