Yes, you are allowed to pack energy drinks in your checked luggage, as there are no FAA or TSA restrictions on non-alcoholic carbonated beverages in the cargo hold. Unlike carry-on bags, which are subject to the "3-1-1" liquids rule, checked bags have no limit on the volume of liquid you can bring. However, you should take precautions to prevent the cans from leaking or bursting due to the pressure and temperature changes in the cargo area; wrapping each can in a sealed plastic bag and cushioning them within your clothing is highly recommended. It is also important to note that while the drinks themselves are fine, most airlines have strict rules against packing large "loose" lithium-ion batteries or high-powered electronics in checked bags, which are sometimes associated with the high-tech marketing of some energy drink brands. As long as the cans are well-protected and the total weight of your suitcase remains within the airline's limits, you can safely bring your favorite energy drinks to your destination.