FAMILIARIZE YOURSELF WITH THE 3-1-1 RULE Understanding and abiding by TSA’s 3-1-1 rule is an important step in ensuring your travels run smoothly. The rule is quite simple. Gels and liquids must be stored in containers of 3.4 ounces or less. These containers must be packaged in a single quart-size Zip-lock style bag. Packing gels can sometimes be a little tricky and confusing. What, exactly, constitutes a gel? Well, According to TSA regulations, item’s such as jams and jellies, lotions, peanut butter and even spreadable cheese are all considered to be gels. These items must be stored in those little containers or will most likely be confiscated. Here is a list of gel-like substances that are not security checkpoint-approved.