We have done a lot of fabric testing and comparison. Thus far, most purchase options seem to be a combination of a pleasant color and then people either choose durability, or weight. Below is a list of fabrics we have used and some of our observations.
XPAC Fabrics
- VX07 - Waterproof, thinner material. Lightweight at 4.9 oz per yard. In a pack bag the weight savings is generally 3 ounces. I have found it fine for normal usage, busting brush etc, but not great for rock abrasions.
- VX21 - Waterproof , mid weight material. Great for busting brush, ok for rock stuff but still could get abraded.
- X33 - Waterproof, about the same weight as VX21 without the internal layer. Cordura faced, and better for exterior rock abrasion. Interior is not as good as VX21 due to the layer missing, although it is important to note it is Cordura and I don't think the interior layer is needed. Availability Multi Cam only
- VX42 - DP claims this is better than the X33 or even the D40. It is a 420 D Cordura face with a thin / slick weave. In my testing , I would put this a bit above X33 or 500 D Cordura in rock abrasion testing (I tested all of these with a sandstone rock and swatch of fabric doing basically a scratch off style abrasion). This fabric adds about 3 ounces per pack bag , above the VX21. Available in black only. This would likely be fine without the interior scrim layer as well.
Cuben - 2.92 ounce per yard. There are a few cuben pack fabrics available, all are the same concept, some with a more robust exterior face. The saves about 6 ounces over VX21 in pack bag. As far as durability I would find it fine for brush busting, it will be rock abrasion that gives it issues. I would consider it about midline between VX07 and VX21.
210D Double Ripstop - 3.9 ounce per yard. Not as light as cuben, but lighter than VX07. Thinner, much more like a recreational lightweight pack fabric. I would find it fine for busting brush most of the time. Once again it will be usage in rock that gets it.
500 D Cordura - Our suspension components use this. It is a tried and true workhorse fabric, although in my testing I would think VX42 out performs it for serious use.