OMEGA Storage Icon
OMEGA Storage is where your OMEGA Items are stored. It is separate from your City Storage. It is unlocked at level 30 after building the OMEGA Research Center. After building an OMEGA Lab you can also build the OMEGA Storage building which will give you an additional 5 storage.
Upgrading[]
The OMEGA Storage starts at a capacity of 10 and increases to 15 once the OMEGA Storage is built. It can be upgraded up to a maximum capacity of 245. Each upgrade will require OMEGA Items. See this chart here showing the number of required items to upgrade your OMEGA Storage.