Flexcubes are UV stabilised and when empty, can be safely stored outside. Full Flexcubes should of course be placed in a protected and preferably temperature-controlled cellar environment.
Flexcubes in pearl colour are UV stable, but do pass visible light. If storing wine outside or near a window, use the opaque grey Flexcube or fit a cover.
When storing empty Flexcubes, care must be taken to ensure they are clean and dry to promote a hygienic internal environment. There is no need for the use of SO2 in storing the Flexcube if it is stored clean & dry.