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I understand that 300D polyester is stronger than 200D polyester but I just saw a backpack, one color scheme says 150D x 300D polyester while the other color scheme of the same backpack is 600D polyester
150D x 300D polyester
vs
600D polyester
Which is stronger? The x part is confusing me, makes it sound like 150 times 350 which is a higher number than 600