The term summa canister is trying to go the way of other product names that have become generic titles for their intended purpose, like Kleenex and Band Aids.  The term summa canister is used in the environmental industry by many professionals to describe the sampling media used for air sampling prior to laboratory testing.  There is, however, inherent risk in believing that summa canister is an acceptable term that defines all air sampling media for TO-15 projects.