A four-layer laminate developed by Dimension-Polyant (a sailcloth manufacturer in Connecticut and Germany) for technical backpacks. Top layer is 210-denier ripstop polyester for abrasion. Below that is an X-pattern grid of high-modulus polyester yarns for tear resistance. Below that is a polyester film for waterproofing. Below that is a tricot backing for hand-feel. Each layer does its job and the laminate behaves like the sum of them. The fabric Hyperlite Mountain Gear, GORUCK, Mystery Ranch (some lines), and dozens of cottage pack makers reach for when they want technical reads, waterproofness, and serious tear resistance under 6 oz/yd². The X grid is visible through the face fabric, and that grid is a designer's signature on the backpack — it announces what the bag is made of.
Four-layer laminate from Dimension-Polyant: (1) face — 210D ripstop polyester (woven, dyed) with DWR; (2) X-grid — 1100-denier polyester yarns laid in a 0.5×0.5 inch X-pattern; (3) film — 6 g/m² polyester (BoPET) film for waterproofness; (4) backing — 50D polyester tricot knit for sewing-friendly hand. Weights span the X-Pac line: VX07 (3.4 oz/yd², ultralight), VX21 (5.1 oz/yd², standard pack — this entry), VX42 (6.5 oz/yd², heavy-duty). Hydrostatic head >2000 mm. Tear strength gains substantially from the X-grid — propagating tears must rupture the high-modulus polyester yarns, which they generally don't. Tensile strength 200+ lbf/in. Hot-cuts cleanly. Sews well with #18 needle and Tex 70+ thread; the tricot backing prevents needle holes from running. Color held in the face fabric — fade-resistant for 1500+ UV hours. Not breathable.
Principled BSDF defaults derived from the sphere fibrous finish. Reasonable seed for Blender, Substance, Keyshot, Rhino — tune per material. Or grab the whole library at once: ForMaterials library →
# finish: fibrous albedo #3c4a3a metallic 0.00 roughness 0.70 ior 1.45 transmission 0.00 clearcoat 0.00 sheen 0.70 anisotropic 0.50
{
"albedo": "#3c4a3a",
"metallic": 0.0,
"roughness": 0.7,
"ior": 1.45,
"transmission": 0.0,
"clearcoat": 0.0,
"sheen": 0.7,
"anisotropic": 0.5
}
# Blender 4.x — Principled BSDF
# X-Pac® VX21 (Sailcloth-Style Pack Laminate) · finish: fibrous
import bpy
mat = bpy.data.materials.new(name="mat_xpac_vx21")
mat.use_nodes = True
bsdf = mat.node_tree.nodes["Principled BSDF"]
bsdf.inputs["Base Color"].default_value = (0.0452, 0.0685, 0.0423, 1.0)
bsdf.inputs["Metallic"].default_value = 0.000
bsdf.inputs["Roughness"].default_value = 0.700
bsdf.inputs["IOR"].default_value = 1.450
bsdf.inputs["Transmission Weight"].default_value = 0.000
bsdf.inputs["Coat Weight"].default_value = 0.000
bsdf.inputs["Sheen Weight"].default_value = 0.700
bsdf.inputs["Anisotropic"].default_value = 0.500
# KeyShot 11+ — lux Python API, Generic material
# X-Pac® VX21 (Sailcloth-Style Pack Laminate) · finish: fibrous
# Run from Window → Scripting Console
import lux
mat = lux.createMaterial(name="mat_xpac_vx21", materialType="Generic")
mat.setProperty("diffuse", (60, 74, 58)) # 8-bit sRGB
mat.setProperty("metallic", 0.000)
mat.setProperty("roughness", 0.700)
mat.setProperty("indexOfRefraction", 1.450)
mat.setProperty("transparency", 0.000)
mat.setProperty("coatingWeight", 0.000)
{
"_format": "Substance Designer / Painter \u2014 pbrMetalRough constants",
"_about": "X-Pac\u00ae VX21 (Sailcloth-Style Pack Laminate) \u00b7 finish: fibrous",
"baseColor": {
"r": 0.0452,
"g": 0.0685,
"b": 0.0423
},
"metallic": 0.0,
"roughness": 0.7,
"ior": 1.45,
"opacity": 1.0,
"anisotropyLevel": 0.5,
"_notes": "Channels listed are the standard Substance pbrMetalRough output. Drop into a Uniform Color node per channel, or as the constant input on a layered stack."
}{
"asset": {
"version": "2.0",
"generator": "ForMatter"
},
"materials": [
{
"name": "mat_xpac_vx21",
"pbrMetallicRoughness": {
"baseColorFactor": [
0.0452,
0.0685,
0.0423,
1.0
],
"metallicFactor": 0.0,
"roughnessFactor": 0.7
},
"extensions": {
"KHR_materials_ior": {
"ior": 1.45
},
"KHR_materials_sheen": {
"sheenColorFactor": [
1.0,
1.0,
1.0
],
"sheenRoughnessFactor": 0.7
}
}
}
]
}# USD Preview Surface — UsdShade.MaterialLook prim attributes
# X-Pac® VX21 (Sailcloth-Style Pack Laminate) · finish: fibrous
def Material "mat_xpac_vx21" {
token outputs:surface.connect = </mat_xpac_vx21/PreviewSurface.outputs:surface>
def Shader "PreviewSurface" {
uniform token info:id = "UsdPreviewSurface"
color3f inputs:diffuseColor = (0.0452, 0.0685, 0.0423)
float inputs:metallic = 0.000
float inputs:roughness = 0.700
float inputs:ior = 1.450
float inputs:opacity = 1.000
float inputs:clearcoat = 0.000
token outputs:surface
}
}
Dimension Polyant X-Pac technical literature.
House vocabulary — terms ForMatter uses with intent.
Materials and processes for people who design and make things.
A local-first library of materials, processes, applications, and finishes — equal weight, citable everywhere, so a student can move from "what is this" toward "what's actually buildable here, now, by me." Part of the renato.design ecosystem — sibling of Plenum, Specimen, Ingenue, gesture, graf, and the Renato Rhino plug-ins. Form and matter, inseparable.
Half of teaching materials is teaching how the material is made into the thing. The standard subscription library was always light on that half. The wedge here isn't better samples or a prettier interface — it's treating Process as a peer entity, not a footnote.
Conway, Lefteri, Forty, Sparke, ASM, GIA. Every voice: Voices.
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