The Transportation Security Administration has an official rule for carrying gels and liquids while traveling. The policy has been named 3-1-1. Three ounces clear plastic bottles for liquids and gels are allowed. All clear plastic containers must fit into a one quart clear plastic bag. Just one clear plastic bag containing these personal items per traveler is allowed. Because the clear plastic bag must not be larger than one quart, its best to use a bag that has its capacity printed on the bag by the manufacturer. Moving thru security and x-ray points at airports can be made easier by carrying other clear plastic see thru bags such as clear plastic totes, diaper bags, back packs and hand bags. Clear plastic brief cases and computer bags are also available from retailers.