TSA bans several items from carry-on bags, including liquids over 3.4 oz (100 ml), sharp blades, firearms, flammable items, tools longer than 7 inches, and some sporting gear. Medications and baby formula are exceptions. These rules help ensure safe domestic air travel. TSA’s searchable “What Can I Bring?” directory details all restricted items:
https://www.tsa.gov/travel/security-screening/whatcanibring
