Antiprotons can be stored pretty much indefinitely (many years) in cryogenic Penning traps. This is done by the BASE collaboration at CERN [1] who are actually neighbors of the group that the article is about.
Could it lead to a new storage method? Helium lasts for microseconds, perhaps other atoms can store it indefinitely. Could that enable bulk antimatter storage?
E.g. 1 mol of mercury that contains 1 mole of anti-protons and doesn't annihilate unless subjected to some extreme condition.
[1] https://base.web.cern.ch/