I have had good luck storing suits in a bag - after they are dry.
Bending a gas tight zipper while closed is bad news, as is leaving it zipped long term, so I never bag or store mine with the zipper zipped. The Fusion is nice in that regard as you can zip the outer zipper to keep it together during storage.
In my experience, I have always been able to get about 5 years per set of seals by keeping the suit in the bag when nt in use, out of the sun, and away from oils. Washing the seals with water or soap and water after use and then coating them lighty with unscented talc helps prolong their life as well.
In the off season I step up a notch and store it in an air tight trash bag and then in the dry suit bag - but be really sure it is really dry.