Per Bill Tuthill:
In the case of rental gear, you've gotta wonder how many times a year
the suits get rented. Probably not as much as I wear my drysuit.

OTOH, on my old Bare Polar - which I retired to hanger in a closet after moving
to a Kokatat bag suit - the seals definitely didn't last 5 years, even in the
dark of the closet. The rubber just sort of melted.

I guess there are other factors, even in an inside storage area - like ozone,
temperature, and so-forth. Also, maybe the Bare's seal would still be with us
if I'd washed it thoroughly before hanging it up...
--
PeteCresswell