I'm not sure if there is variability with the manufactures but mine smelled so bad that I threw them out. I mean really bad. I have my extra hiking stuff stored in an old pack. I opened it and it really smelled bad. I then thought OK it was in there for a while so the smell built up. I put some in my car and current pack and the smell was in the car as well. So it wasn't a build up issue. Needless to say I just threw them out.