The total weight for the docena was close to that of the Berthoud 28 bag, which is significantly smaller. The fabric itself weighs about 1/3 the weight or less then the canvas used by berthoud, and 1/5 of the #8 or heavier duck used by Ruthworks, Watanabe and the like. Once you start adding in stiffiners and hardware the playing field levels a bit. THe docena also weighed in about 20% lighter than a comparable Swift bag made with Cordura and the Vinyl liner. With one bag the weight savings is not that much, but if you use the logic across a Doceana, set of panniers, frame bag and saddle bag for a full touring kit it adds up quickly to about a 5lb savings. Waxed canvas looks cool, but is crazy heavy for the purpose. In a standalone waterproofing test of the material, the XPac would crush the canvas, the mylar inner sheet is completely water tight. THe seams are the weak point in all of the bags. Experience has led me to think that standard seams are just fine for 99% of us. If complete waterproofness were a requirement, one could seal the seams on the inside, or use a secondary dry bag for specific gear. Long term durability of the material with respect to UV has been pretty good. The face material is 210 denier pack cloth and holds up as well as it would otherwise. The laminating process is based on their sail making tech and has proven robust at that application, which is much harder on the materials than a bar bag. The 210 denier cloth is not well suited to perpetual rubbing and abrasion at a hard edge, like a bottle boss on the inner frame. This is why frame bag builders will generally opt to use ballistic cloth on the contact surfaces of the bags. In general the only parts of the bar bag designs that see abrasion are the edges, and they are protected with the binding material. Standard urethane linings on Cordura break down and either peel or get gummy after 8-10 years, this makes me nuts and why I worked so hard on sourcing an alternative. The conventional bag work around for the Cordura is to use a lining, or take the usable lifespan for what it is. We may explore both in the coming years, but I would rather start with XPac as what I view as the best available option. I think the current thermal plastic coating tech for pack cloth holds the most promise, think lightweight ortlieb material, but it is still maturing a bit as a technology.