No, it will not accommodate a larger flag.
That 30 ft VEVOR telescopic flagpole is typically designed for the included 3×5 ft flag, with a recommended maximum of about 4×6 ft (sometimes 5×8 ft in calm, low-wind areas).
Going larger increases wind load a lot, which can cause bending, excessive noise, or faster wear on the telescoping sections and halyard system.
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By vevor