James Taylor: Roll tops are especially unsuited for this material, as it is the part of the modern pack seeing the most scrunching/repeated folding. Of course roll tops needs both abrasion resistance (for those of us traveling in canyon country and bushwhacking) and some level of waterproofness, so…
I made a pack with a lid instead of roll top, using Ultra TX, a lined laminated version of UltraWeave. This gives me abrasion properties and the ability to shed water without having to roll the fabric all the time:
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Similarly I used Ultra TX for a seamless compound curved bottom piece to get the durability where it really matters when scrambling around on sandstone.
For me the value of Ultra TX is still somewhat up in the air, but initially it seems a lot better.