What is United Airlines' personal item size limit?

Carry-On and Personal Item Size Limits for 32 Major Airlines

Carry-on crackdown: United Airlines enforces bag size limit - Deseret News

Carry-on Bags United Airlines

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United carry-on (9x14x22) and personal item (9x17x10) dimensions (same for Delta)

What is United Airlines' personal item size limit?

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Carry-On and Personal Item Size Limits for 32 Major Airlines