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@Archie's_Grobags
It's not always the same stuff.
That's like saying a colnago is made from the same stuff as a raleigh mustang.
The base fabric can be different...either polyester or nylon...it can be a different strength weave too.
The PVC coating also varies in thickness and quality and also comes in different finishes which can affect the suppleness of the finished fabric.
That's why different companies state different weights for their liners.
Truck tarp sidings are usually far heavier weight than a lot of bag companies use...for example, chrome liners are thinner than reload liners.
That's why the sign fabrics are usually easier to sew.