From the TSA website, second paragraph addresses your question.
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Holiday Travel Tips
Travelers should remember the three simple steps to security: have IDs out, coats and shoes off, and laptops and 311 bags out for screening. TSA reminds travelers to follow 311 for carry-on luggage for non-exempt
liquids: 3 ounce bottle or less for all liquids, gels and aerosols; placed in a 1 quart-sized, clear, plastic, zip-top bag to hold all small bottles; 1 bag per passenger placed in screening bin. The limitations on liquids apply only to carry-on bags and larger quantities may be packed in checked baggage.
TSA also recommends that passengers do not travel with wrapped packages. In order to determine if the contents of a package are a threat, a security officer may need to unwrap and inspect the item. Snow globes of any size are not permitted in carry-on bags because officers cannot accurately determine the volume of liquid. TSA recommends passengers pack these items securely in checked baggage.
Food items such as pies and cakes are permitted but may require further inspection. If travelers are not sure if a food item is considered a liquid or gel it is best to pack the item in checked baggage or ship it to a destination in advance.
TSA reminds travelers to be vigilant during the holiday travel season by reporting suspicious activity to local law enforcement. The traveling public plays an important role in security, so If You See Something, Say Something.
http://www.tsa.gov/press/releases/2011/1114.shtm