What you can't send in a parcel

Cash and valuables
Perfume, nail polish, aerosols — alcohol under pressure
Alcohol and tobacco above personal limits
Batteries shipped separately from the device
Perishable food
Prescription medicine

Perfume is the one people ask about most. Technically it's dangerous goods, and half the carriers won't take it at all.

If it's found during screening, the parcel is held and the insurance doesn't apply.