Please define an appropriate quantity.
Thank you.
Look at the TSA sites:
http://www.tsa.gov/311/index.shtm
http://www.tsa.gov/travelers/airtrav...ted-items.shtm
3-1-1 for carry-ons =
3 ounce bottle or less (by volume) ;
1 quart-sized, clear, plastic, zip-top bag;
1 bag per passenger placed in screening bin.
One-quart bag per person limits the total liquid volume each traveler can bring. 3 oz. container size is a security measure.