TSA Screening & Customs Rules
Transportation Security Administration • Jurisdiction: United States
Enforces airport checkpoint security screening, the 3-1-1 liquids rule, and prohibited items regulations across all commercial US passenger airports.
Official Rules Issued by TSA
3-1-1 Liquids Rule for Carry-On Bags
Verified 2026-08-24Liquids, aerosols, and gels must be in containers 3.4 oz (100 ml) or smaller inside a clear quart-sized bag. One bag per traveler.
Scissors & Small Blade Limit
Verified 2026-07-30Scissors with blades under 4 inches from the pivot point are permitted in carry-on bags. Knives and longer blades are strictly checked luggage only.
Powder Substances Checkpoint Screening (12 oz Rule)
Verified 2026-08-04Powder-like substances in containers exceeding 12 oz (350 ml) require separate bin screening and secondary chemical inspection.
Sample Catalog Items Governed by TSA
View All 918 Items →These items fall directly under TSA security checkpoints or border entry requirements. Click any item for the complete cabin vs checked verdict: