Suppose it's better than saran wrap.
And at least it's flexible, so curved seams are doable.
It doesn't take bushwhacking to abrade a pack. A 1.9 oz. vinyl coated ripstop material abraded quickly on the top of a MYOG pack in several weeks of hiking in open country in Colorado where the worst it got was an occasional brush from a tree branch or leaves.
I think it might have been polyester, not nylon - still have some, so suppose stretching it on an embroidery hoop and putting it outside would show which, by reference to whether it wrinkles or not.
But even without more tiresome tests, nylon seems the best for packs, because of its abrasion resistance, and its suppleness and flexibility make it so easy to sew, and configure to pack shapes. But it is so hard to find nylon with a good coating that is really waterproof - the many reports on this site certainly attest to that. Since you don't appear to have issues with very high strength or abrasion, maybe the Thru-Hiker silnylon would make you a really nice waterproof pack. Some posts suggest that Ray Jardine's stuff is highly water resistant, also, and it comes in more colors. But I don't think it is as strong as the stuff T-H sells. The cordura silnylon that Lightheart Gear sells appears more abrasion resistant, but unfortunately is much less water resistant than the material from Thru-Hiker.
Or there is the Toray Industries product used by kiters called Chikara, that weighs a little less than silnylon, has a double PU coating, and is reported to be quite waterproof, even used for tent floors. Maybe Richard Nisley will test some and report on it. Not sure how stiff it is.
Unfortunately, as noted, something more abrasion resistant is needed where I hike. And the coated 70-200 denier nylons available for MYOG are not very waterproof, whether sil or PU. The packs leak after moderate use. There are some pretty nice coatings on packs at the shops, but not available from MYOG suppliers. There are the stiffer mylar laminates, but I don't relish sewing them. Tried the lightest flexible one, VX07, the needle holes were scary, and it's quite heavy at around 5 oz.
So the hunt continues for an abrasion resistant nylon under 3 oz including a really good waterproof coating.
BTW, thank you for that post last spring about the kite studio post about break tests of ferrules. May have found some for .245" I.D. carbon, like SS P400 or Victory, and will post if they pan out.