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With also offering the X21 RC fabric now, can you comment on the difference of not having the polyester scrim layer? Have you found that the x-pac fabrics without the inner scrim like the X-33 and the X-21 hold up as well on the inside? How tough it just the PET layer? Are there any other differences? Is the X-21 material more flexible than VX-21?

X21 RC is less stiff and more pliable. We have not seen any problems with the X33 and it has been well used and is essentially the same type of construction, and I have inspected a few bags that have been used A LOT. That being said, it's one of things of packing light, understanding what you are using. If you have something that is highly abrasive, take a little care of put it in a sack.

Just in case anyone is looking for this in the future:

VX-21

210 denier double ripstop nylon with black polyester X-Ply reinforcement threads at 22 degrees. .25 mil PET film with a 50 denier polyester taffeta

Weight: 6oz per Sq/Yd
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X-21 RC

210 denier double ripstop nylon with black polyester X-Ply reinforcement threads at 22 degrees. X 21 RC uses the same 210 denier face fabric as the VX21 but has a .5 mil shiny polyester PET film backing instead of a woven polyester

Weight: 4.4oz per Sq/Yd
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and for Reference:

VX-42

420 denier double ripstop nylon with black polyester X-Ply reinforcement threads at 22 degrees. .25 mil PET film with a 50 denier polyester taffeta backing

Weight: 8oz per Sq/Yd
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500D Cordura

Weight 8oz per Sq/Yd
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210D Dyneema Grid

Weight 4.4oz per Sq/Yd