I used to work for 3M specialty film production plant. These type of material held up pretty good under normal use, but should be replaced it every six months or so. My best guesstimate that you probably left it there for too long.
Jason Holiday replied to the topic Medium Format is worth it even for web sized prints in the forum Miscellaneous Gear 6 years, 7 months ago
thanks for the heads up
Jason Holiday replied to the topic Leica 18746 small system bag (used for X Vario camera) in the forum X System 6 years, 7 months ago
where did you get this?