A backpack nuke is a portable nuclear weapon that is small and light enough to be carried in a backpack or other similar bags. This type of weapon is also known as a suitcase nuke, portable nuke, or mini nuke. Another term used for this type of weapon is the nuclear briefcase, which refers to the case that holds the device. Other synonyms for backpack nuke include man-portable nuclear device, portable atomic bomb, and miniaturized nuclear bomb. However, it is important to note that these weapons are illegal and extremely dangerous due to their potential to cause widespread devastation and long-term environmental damage.