In a previous Attackpoint thread, map bags were stated to be made of “Poly” with some contributors identifying this as Polyethylene, or Low Density PolyEthylene ( LDPE)
http://www.attackpoint.org/discussionthread.jsp/me...In Tasmania we have just switched from Polyethylene to bags made from Polypropylene, (More specifically BOPP: Biaxially Orientated PolyPropylene) with a thickness of 45 microns (1.77mil) because we think the bags are clearer and tougher.
There are some comparison pictures of both bag types with and without maps in the latest edition of our on line magazine:
https://indd.adobe.com/view/8367ab69-5917-4929-a23...These map bags are disposable and foldable and not the heavier reusable map “cases” typically used for rogaining events.
Is anyone else using Polypropylene bags who can comment on their comparative performance? Do some people mean Polypropylene when referring to "Poly" bags?
The only downside we have noticed so far apart from slightly more expense is one or two bags splitting on the side when inserting the map.