Where is all the "fake" gridstop?

Believe Rockywoods has 210D for $17/yd.  Although if you’re just making prototypes why not design them using something much cheaper? Think makeyourgear sales a 300D polyester for $8/yd that would work.

That Dyneema stuff is ultra-high-molecular-weight-polyethylene.  The “fake” stuff you are looking for, as exampled by your Exped reference, is called high-modulous-polyethylene, or HMPE on the Exped website, and is, as a matter of fact, the same stuff.  There are a few companies that do this sort plastic, but I believe that Dyneema is the only one who specifically makes it in the form that we all know it as (outdoor gear fabric).

So, my guess is that Exped is using Dyneema but I suppose it is possible they are having the fabric specially made for them, hence the name “change” since Dyneema is trademark.

Dyneema is a brand name for HDPE (High Density PolyEthylene) just as Dacron is a brand name for polyester. Using the generic version keeps the cost down.

From the ZPacks web site – “This product was formerly referred to as “Dyneema X Gridstop” however it is now made with equivalent HDPE fiber rather than branded Dyneema.”

PS – every time you buy Cordura you send a few cents off to the Koch brothers to help them screw up the planet.