It's a frequent question "Can I take jam on a plane" Although the answer is not entirely apparent, it is important to take into account the rules and regulations pertaining to food on flights. To guarantee the security and safety of passengers, transportation agencies like the TSA have developed regulations. There are limitations you need to be aware of while bringing jam on board. According to the 3-1-1 rule, your jam jar must weigh no more than 3.4 ounces (100 millilitres) and fit inside a quart-sized plastic bag with other liquid or gel goods.