Hyperice Hypersphere Mini
Softballs can work wonders for pinpointing various trigger point areas in the body. The diameter makes it useable on areas like the quads, hamstrings, pecs and the front of the hips. It provides a huge amount of value as it is cheap and versatile. When traveling, you can get away with bringing just a softball ball to treat most of the major areas.
For example, nothing quite gets at the TFL area (dress pant pocket line of body) like a softball, which is a very common area of tension. A softball is also large enough to work on the chest against a wall, another area most everyone should be addressing!