u/Amazing-Fennel-2685

I bought this Atmos65 off eBay for $115. And overall, I’m really happy with it. No tears, holes or rips anywhere. However, there’s this sticky, blue like coating on parts of the inside that roll up into glue like pellets and get all over my stuff. It’s only in certain parts of the interior of the bag. Does anyone know what it is and the easiest ways to remove it? I’ve been trying to wipe it off with a wet rag which has worked is taking way longer than I’d like. Is the pack damaged severely somehow?