3 1 1 Rule groups guides that share a narrow practical intent. This is not a keyword-stuffing page: it exists to help readers move laterally between closely related problems and to give search crawlers a clean HTML path into the strongest guides.
Most pages here belong to TSA Liquids. Open the guide closest to your exact situation; use the parent topic hub when you need broader background.
Tags with too few useful guides remain noindex,follow. That keeps low-value archive pages from competing with the actual articles while preserving crawl paths.
For normal U.S. security screening, carry-on liquids still follow TSA rules unless an exemption applies. If you must exit and re-enter security during a connection, items obtained after the first checkpoint can become.