Answer
Aerosols, lithium batteries, alcohol, and some chemicals face carrier restrictions. When in doubt, ask the counter clerk before packing. Flying with restricted items in checked bags has separate TSA rules—do not mix the two systems casually.
Sources: USPS · UPS/FedEx hazmat guidance · TSA
Editorial visitor guidance for Ocean City, Maryland. Confirm current Town of Ocean City, Maryland DNR, NPS Assateague, and NWS rules when regulations or safety apply.
